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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Feb. 25, 2015
Stockholders' Equity Note [Abstract]          
Stock repurchase program, number of shares authorized for repurchase         2,000,000
Treasury stock, shares acquired     180,100 175,085  
Treasury stock, acquired     $ 2,600 $ 6,100  
Treasury stock acquired, average cost per share     $ 14.62 $ 34.89  
Stock repurchase program, remaining number of shares authorized to be repurchased 1,096,989   1,096,989    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]          
Beginning Balance, net of taxes $ (92,538) $ (100,204) $ (93,015) $ (101,498)  
Net actuarial gain, before taxes 0 19,345 0 19,345  
Amortization of actuarial loss, before taxes [1] 478 1,312 956 2,910  
Effect of settlements, before taxes [1] 0 0 297 501  
Income taxes (184) (7,926) (482) (8,731)  
Ending Balance, net of taxes $ (92,244) $ (87,473) $ (92,244) $ (87,473)  
[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 8, Retirement and Benefit Plans.