Annual report pursuant to Section 13 and 15(d)

THREE-FOR-TWO STOCK SPLIT - Effects of Stock Split on Stockholders' Equity (Details)

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THREE-FOR-TWO STOCK SPLIT - Effects of Stock Split on Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
STOCKHOLDERS’ EQUITY          
Preferred stock, without par value; 500,000 authorized, zero shares issued   $ 0 $ 0  
Common stock, par value $1 per share; 250,000,000 shares authorized, 218,482,907 shares issued 218,483   217,992 217,792  
Treasury Stock, par value $1 per share ; 200,000 and 0 shares, respectively (200)        
Paid-in-capital 62,839   81,405 77,452  
Accumulated other comprehensive loss (65,488)   (45,956) (70,075)  
Retained earnings 247,042   400,483 343,376  
Total Stockholders’ Equity $ 462,676   $ 653,924 $ 568,545 $ 524,029
Shares issued during the period (in shares) 72,760,969 72,932,222      
Preferred stock, authorized (in shares)     500,000 500,000 500,000
Preferred stock, issued (in shares)     0 0 0
Common stock, par value (in dollars per share)     $ 1 $ 1 $ 1
Common stock, authorized (in shares)     375,000,000 375,000,000 250,000,000
Common stock, issued (in shares)     217,992,177 217,791,511 218,482,907
Treasury stock (in shares)         200,000
Pro forma          
STOCKHOLDERS’ EQUITY          
Preferred stock, without par value; 500,000 authorized, zero shares issued        
Common stock, par value $1 per share; 250,000,000 shares authorized, 218,482,907 shares issued 145,722        
Treasury Stock, par value $1 per share ; 200,000 and 0 shares, respectively (200)        
Paid-in-capital 62,839        
Accumulated other comprehensive loss (65,488)        
Retained earnings 319,803        
Total Stockholders’ Equity 462,676        
Adjustment          
STOCKHOLDERS’ EQUITY          
Common stock, par value $1 per share; 250,000,000 shares authorized, 218,482,907 shares issued 72,761        
Retained earnings $ (72,761)