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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 25, 2015
Common stock, authorized 300,000,000 300,000,000    
Preferred stock, authorized 50,000,000 50,000,000    
Preferred Stock, issued 0 0    
Preferred Stock, outstanding 0 0    
Common stock, issued 43,519,647 43,412,660    
Common stock, outstanding 38,352,574 38,825,687    
Stock repurchase program, number of shares authorized for repurchase       2,000,000
Treasury stock, acquired $ 10,268 $ 23,711    
Stock repurchase program, remaining number of shares authorized to be repurchased 696,989      
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Beginning Balance, net of taxes $ (93,015) (101,498) $ (55,249)  
Net actuarial gain (loss), current-period changes, before taxes 9,622 8,406 (75,016)  
Amortization of actuarial (gain) loss, amounts reclassified from accumulated other comprehensive loss, before taxes [1] 2,484 4,884 (23)  
Effects of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes [1] 4,155 501 0  
Income taxes (6,258) (5,308) 28,790  
Ending Balance, net of taxes $ (83,012) $ (93,015) $ (101,498)  
Treasury Stock [Member]        
Treasury stock, shares acquired 580,100 722,911    
Treasury stock, acquired $ 10,268 $ 23,711    
Treasury stock acquired, average cost per share $ 17.70 $ 32.80    
[1] Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 9, Retirement and Benefit Plans.