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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Feb. 25, 2015
Stockholders' Equity Note [Abstract]          
Stock repurchase program, number of shares authorized for repurchase         2,000,000
Treasury stock, shares acquired       180,100  
Treasury stock, acquired       $ 2,600  
Treasury stock acquired, average cost per share       $ 14.62  
Stock repurchase program, remaining number of shares authorized to be repurchased 696,989   696,989    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]          
Beginning Balance, net of taxes $ (82,769) $ (92,538) $ (83,012) $ (93,015)  
Amortization of actuarial loss, before taxes [1] 410 478 805 956  
Effect of settlements, before taxes [1] 0 0 0 297  
Income taxes (158) (184) (310) (482)  
Ending Balance, net of taxes $ (82,517) $ (92,244) $ (82,517) $ (92,244)  
[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 7, Retirement and Benefit Plans.