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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 49,123       49,123
Purchase of treasury stock (189,834)   (189,834)    
Issuance of treasury stock     5,517 (5,517)  
Amounts related to share-based compensation (3,030)     (3,030)  
Share-based compensation expense 4,353     4,353  
Ending balance at Jun. 30, 2015 719,317 $ 468 (235,390) 553,677 400,562
Balance (in shares) at Jun. 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 132,184       132,184
Purchase of treasury stock (167,105)   (167,105)    
Issuance of treasury stock     6,748 (6,748)  
Amounts related to share-based compensation (4,237)     (4,237)  
Share-based compensation expense 4,780     4,780  
Ending balance at Jun. 30, 2016 $ 757,912 $ 468 $ (454,496) $ 551,977 $ 659,963
Balance (in shares) at Jun. 30, 2016   46,767,164