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Consolidated and Combined Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
APIC [Member]
Net Parent Investment [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2012 $ 1,104,451 $ 0 $ 0 $ 0 $ 1,104,451 $ 0
Balance, shares at Dec. 31, 2012   0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 235,033       127,457 107,576
Dividend paid to former parent (650,000)       (650,000)  
Net transfers to/between former parent (36,062)       (36,062)  
Issuance of stock at the separation and distribution   $ 467   (467)    
Issuance of stock at the separation and distribution, shares   46,743,316        
Reclassification of net parent investment to APIC       545,846 (545,846)  
Issuance of common stock, shares   317        
Share-based compensation expense 2,914     2,914    
Balance at Dec. 31, 2013 656,336 $ 467 0 548,293 0 107,576
Balance, shares at Dec. 31, 2013   46,743,633.000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 243,863         243,863
Issuance of common stock, shares   23,531        
Issuance of common stock 1 $ 1        
Purchase of treasury stock (51,348)   (51,348)      
Issuance of treasury stock     275 (275)    
Amounts related to share-based compensation (582)     (582)    
Share-based compensation expense 10,435     10,435    
Balance at Dec. 31, 2014 $ 858,705 $ 468 (51,073) 557,871 0 351,439
Balance, shares at Dec. 31, 2014 46,767,164 46,767,164        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 176,340         176,340
Purchase of treasury stock (248,695)   (248,695)      
Issuance of treasury stock     5,629 (5,629)    
Amounts related to share-based compensation (3,075)     (3,075)    
Share-based compensation expense 9,015     9,015    
Balance at Dec. 31, 2015 $ 792,290 $ 468 $ (294,139) $ 558,182 $ 0 $ 527,779
Balance, shares at Dec. 31, 2015 46,767,164 46,767,164