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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Changes in accumulated other comprehensive income [Roll Forward]    
Beginning balance at Beginning of period $ 1,786  
Other comprehensive income before reclassifications (612)  
Amounts reclassified from accumulated other comprehensive income (104)  
Current period other comprehensive income, net (716)  
Ending balance at End of period 1,070  
Amortization of pension and postretirement benefit plans [Abstract]    
Prior service benefit 754 1,080
Unrecognized loss (592) (785)
Income tax benefit (58) (108)
Total reclassifications for the period 47,594 49,610
Reclassification out of Accumulated Other Comprehensive Income [Member]
    
Amortization of pension and postretirement benefit plans [Abstract]    
Prior service benefit (754) [1]  
Unrecognized loss 592 [1]  
Total before income tax (162)  
Income tax benefit 58  
Total reclassifications for the period (104)  
Foreign Currency Translation Adjustments [Member]
    
Changes in accumulated other comprehensive income [Roll Forward]    
Beginning balance at Beginning of period 3,562  
Other comprehensive income before reclassifications (590)  
Amounts reclassified from accumulated other comprehensive income 0  
Current period other comprehensive income, net (590)  
Ending balance at End of period 2,972  
Unrecognized Pension and Postretirement Benefit Costs (Credit) [Member]
    
Changes in accumulated other comprehensive income [Roll Forward]    
Beginning balance at Beginning of period (1,776)  
Other comprehensive income before reclassifications (22)  
Amounts reclassified from accumulated other comprehensive income (104)  
Current period other comprehensive income, net (126)  
Ending balance at End of period $ (1,902)  
[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement benefit costs, which are included in selling, general and administrative expenses in our consolidated statements of operations (see Note 11 for additional details).