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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Feb. 25, 2015
Stockholders' Equity Note [Abstract]          
Stock repurchase program, number of shares authorized for repurchase         2,000,000
Treasury stock, shares acquired     722,911    
Treasury stock, acquired     $ 23,700    
Treasury stock acquired, average cost per share     $ 32.80    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]          
Beginning Balance, net of taxes $ (87,473) $ (55,257) $ (101,498) $ (55,249)  
Net actuarial gain, before taxes 0 0 19,345 0  
Amortization of actuarial (gain) loss, amounts reclassified from accumulated other comprehensive loss, before taxes [1] 987 (5) 3,897 (17)  
Effect of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes [1] 0 0 501 0  
Income taxes (379) 2 (9,110) 6  
Ending Balance, net of taxes $ (86,865) $ (55,260) $ (86,865) $ (55,260)  
[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 6, Retirement and Benefit Plans.