Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT AND STOCK COMPENSATION PLANS (Details)

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EMPLOYEE BENEFIT AND STOCK COMPENSATION PLANS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
EMPLOYEE BENEFIT AND STOCK COMPENSATION PLANS      
Period based on which benefits are based on the highest average compensation during last ten years (in years) 5    
CHANGE IN ACCUMULATED BENEFIT OBLIGATION      
Accumulated Benefit obligation at beginning of year $ 183,972 $ 159,539  
Pension plans acquired upon acquisitions of companies   5,317  
Service cost 158 86  
Interest cost 9,879 9,514  
Actuarial (gain) loss 12,205 16,651  
Benefits paid (8,793) (7,135)  
Liability gain due to curtailment (510)    
Accumulated Benefit obligation at end of year 196,911 183,972 159,539
CHANGE IN PLAN ASSETS      
Market value of plan assets at beginning of year 171,457 144,644  
Pension plans acquired upon acquisitions of companies   3,733  
Actual return on plan assets (2,520) 25,039  
Contribution by employer 4,900 5,176 5,000
Benefits paid (8,793) (7,135)  
Fair value of plan assets at end of year 165,044 171,457 144,644
Funded status (31,867) (12,515)  
Amounts recognized in the statement of financial position      
Noncurrent liabilities (31,867) (12,515)  
Amounts recognized in accumulated other comprehensive income      
Net loss 87,035 62,538  
ACCUMULATED BENEFIT OBLIGATION      
Discount rate (as a percent) 5.01% 5.51% 6.01%
NET BENEFIT COST      
Discount rate (as a percent) 5.51% 6.01% 6.81%
Expected return on plan assets (as a percent) 7.00% 7.00% 7.00%
Net Periodic Benefit Cost      
Service cost 158 86  
Interest cost 9,879 9,514 9,530
Expected return on plan assets (12,080) (11,437) (10,974)
Amortization of net loss 1,800 1,115 963
Net periodic benefit (243) (722) (481)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income      
Net (gain)/loss 26,297 3,048 986
Amortization of net loss (1,800) (1,115) (963)
Total recognized in other comprehensive income 24,497 1,933 23
Total recognized in net periodic benefit cost and other comprehensive income $ 24,254 $ 1,211 $ (458)