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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 24, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Feb. 25, 2015
Treasury Stock [Line Items]            
Stock repurchase program, number of shares authorized for repurchase           2,000,000
Treasury stock, shares acquired   175,085        
Treasury stock, acquired   $ 6,100        
Treasury stock acquired, average cost per share   $ 34.89        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]            
Beginning Balance, net of taxes $ (87,473) $ (100,204) $ (55,253) $ (101,498) $ (55,249)  
Net actuarial gain, before taxes   19,345 0 19,345 0  
Amortization of actuarial (gain) loss, amounts reclassified from accumulated other comprehensive loss, before taxes [1]   1,312 (6) 2,910 (12)  
Effect of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes [1]   0 0 501 0  
Income taxes   (7,926) 2 (8,731) 4  
Ending Balance, net of taxes   $ (87,473) $ (55,257) $ (87,473) $ (55,257)  
Subsequent Event [Member]            
Treasury Stock [Line Items]            
Treasury stock, shares acquired 176,261          
Treasury stock, acquired $ 5,900          
Treasury stock acquired, average cost per share $ 33.57          
[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.