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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 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     180,100 722,911  
Treasury stock, acquired     $ 2,600 $ 23,700  
Treasury stock acquired, average cost per share     $ 14.62 $ 32.80  
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 $ (92,244) $ (87,473) $ (93,015) $ (101,498)  
Net actuarial gain, before taxes 0 0 0 19,345  
Amortization of actuarial loss, before taxes [1] 584 987 1,540 3,897  
Effect of settlements, before taxes [1] 0 0 297 501  
Income taxes (225) (379) (707) (9,110)  
Ending Balance, net of taxes $ (91,885) $ (86,865) $ (91,885) $ (86,865)  
[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.