Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3)

v2.4.0.6
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Earnings per share                      
Stock split conversion terms                   three-for-two, with fractional shares settled in cash  
Reconciliation of weighted average shares outstanding along with the earnings per share attributable to restricted shares of common stock (participating securities)                      
Net Income $ 21,595 $ 29,415 $ 31,061 $ 18,640 $ 19,206 $ 25,513 $ 27,700 $ 17,583 $ 100,711 $ 90,002 $ 83,984
Less: Dividends paid                 (41,110) (35,521) (27,853)
Undistributed earnings for the period                 59,601 54,481 56,131
Allocation of undistributed earnings:                      
Undistributed earnings                 59,601 54,481 56,131
Basic shares outstanding:                      
Basic shares outstanding                 146,882 148,030 149,179
Diluted shares outstanding                      
Basic shares outstanding                 146,882 148,030 149,179
Diluted shares outstanding                 146,946 148,231 149,624
Basic earnings per share                      
Distributed earnings basic (in dollars per share)                 $ 0.28 $ 0.24 $ 0.19
Undistributed earnings basic (in dollars per share)                 $ 0.41 $ 0.37 $ 0.37
Total shares of common stock, basic (in dollars per share) $ 0.15 $ 0.20 $ 0.21 $ 0.13 $ 0.13 $ 0.17 $ 0.19 $ 0.12 $ 0.69 $ 0.61 $ 0.56
Diluted earning per share:                      
Distributed earnings diluted (in dollars per share)                 $ 0.28 $ 0.24 $ 0.19
Undistributed earnings diluted (in dollars per share)                 $ 0.41 $ 0.37 $ 0.37
Total shares of common stock, diluted (in dollars per share) $ 0.15 $ 0.20 $ 0.21 $ 0.13 $ 0.13 $ 0.17 $ 0.19 $ 0.12 $ 0.69 $ 0.61 $ 0.56
Common Stock
                      
Reconciliation of weighted average shares outstanding along with the earnings per share attributable to restricted shares of common stock (participating securities)                      
Less: Dividends paid                 (40,383) (34,871) (27,370)
Undistributed earnings for the period                 58,497 53,419 55,098
Allocation of undistributed earnings:                      
Undistributed earnings                 58,497 53,419 55,098
Diluted allocation of undistributed earnings                 58,498 53,421 55,101
Basic shares outstanding:                      
Basic shares outstanding                 144,162 145,145 146,433
Diluted shares outstanding                      
Basic shares outstanding                 144,162 145,145 146,433
Dilutive effect of stock options (in shares)                 64 201 445
Diluted shares outstanding                 144,226 145,346 146,878
Basic earnings per share                      
Distributed earnings basic (in dollars per share)                 $ 0.28 $ 0.24 $ 0.19
Undistributed earnings basic (in dollars per share)                 $ 0.41 $ 0.37 $ 0.37
Total shares of common stock, basic (in dollars per share)                 $ 0.69 $ 0.61 $ 0.56
Diluted earning per share:                      
Distributed earnings diluted (in dollars per share)                 $ 0.28 $ 0.24 $ 0.19
Undistributed earnings diluted (in dollars per share)                 $ 0.41 $ 0.37 $ 0.37
Total shares of common stock, diluted (in dollars per share)                 $ 0.69 $ 0.61 $ 0.56
Restricted shares of common stock
                      
Reconciliation of weighted average shares outstanding along with the earnings per share attributable to restricted shares of common stock (participating securities)                      
Net Income                 100,711 90,002 83,984
Less: Dividends paid                 (727) (650) (483)
Undistributed earnings for the period                 1,104 1,062 1,033
Allocation of undistributed earnings:                      
Undistributed earnings                 1,104 1,062 1,033
Diluted allocation of undistributed earnings                 $ 1,103 $ 1,060 $ 1,030
Basic shares outstanding:                      
Basic shares outstanding                 2,720 2,885 2,746
Diluted shares outstanding                      
Basic shares outstanding                 2,720 2,885 2,746
Basic earnings per share                      
Distributed earnings basic (in dollars per share)                 $ 0.27 $ 0.23 $ 0.19
Undistributed earnings basic (in dollars per share)                 $ 0.41 $ 0.37 $ 0.37
Total shares of common stock, basic (in dollars per share)                 $ 0.68 $ 0.60 $ 0.56
Diluted earning per share:                      
Distributed earnings diluted (in dollars per share)                 $ 0.27 $ 0.23 $ 0.19
Undistributed earnings diluted (in dollars per share)                 $ 0.41 $ 0.37 $ 0.37
Total shares of common stock, diluted (in dollars per share)                 $ 0.68 $ 0.60 $ 0.56