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Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
APIC
Retained Earnings
Beginning balance at Dec. 31, 2014 $ 858,705 $ 468 $ (51,073) $ 557,871 $ 351,439
Balance (in shares) at Dec. 31, 2014   46,767,164      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 109,654       109,654
Purchase of treasury stock (248,695)   (248,695)    
Issuance of common stock 0        
Issuance of treasury stock 0   5,562 (5,562)  
Amounts related to share-based compensation (3,035)     (3,035)  
Share-based compensation expense 6,811     6,811  
Ending balance at Sep. 30, 2015 723,440 $ 468 (294,206) 556,085 461,093
Balance (in shares) at Sep. 30, 2015   46,767,164      
Beginning balance at Dec. 31, 2015 792,290 $ 468 (294,139) 558,182 527,779
Balance (in shares) at Dec. 31, 2015   46,767,164      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 177,675       177,675
Purchase of treasury stock (212,328)   (212,328)    
Issuance of common stock 0        
Issuance of treasury stock 0   9,356 (9,356)  
Amounts related to share-based compensation (5,395)     (5,395)  
Share-based compensation expense 6,945     6,945  
Ending balance at Sep. 30, 2016 $ 759,187 $ 468 $ (497,111) $ 550,376 $ 705,454
Balance (in shares) at Sep. 30, 2016   46,767,164