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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Changes in accumulated other comprehensive income [Roll Forward]        
Beginning balance at Beginning of period $ 1,814   $ 3,879  
Other comprehensive income before reclassifications 1,041   (584)  
Amounts reclassified from accumulated other comprehensive income (187)   (627)  
Current period other comprehensive income, net 854   (1,211)  
Ending balance at End of period 2,668   2,668  
Amortization of pension and postretirement benefit plans [Abstract]        
Prior service benefit 1,078 [1] 1,197 3,238 [1] 3,589
Unrecognized loss (781) [1] (773) (2,342) [1] (2,321)
Amount reclassified from accumulated other comprehensive income, income tax benefit (110) (161) (269) (310)
Total reclassifications for the period 50,615 50,937 150,813 142,322
Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Amortization of pension and postretirement benefit plans [Abstract]        
Prior service benefit (1,078) [1]   (3,238) [1]  
Unrecognized loss 781 [1]   2,342 [1]  
Amount reclassified from accumulated other comprehensive income, total before income tax (297)   (896)  
Amount reclassified from accumulated other comprehensive income, income tax benefit 110   269  
Total reclassifications for the period (187)   (627)  
Foreign Currency Translation Adjustments [Member]
        
Changes in accumulated other comprehensive income [Roll Forward]        
Beginning balance at Beginning of period 2,911   4,663  
Other comprehensive income before reclassifications 1,033   (719)  
Amounts reclassified from accumulated other comprehensive income 0   0  
Current period other comprehensive income, net 1,033   (719)  
Ending balance at End of period 3,944   3,944  
Unrecognized Pension and Postretirement Benefit Costs (Credit) [Member]
        
Changes in accumulated other comprehensive income [Roll Forward]        
Beginning balance at Beginning of period (1,097)   (784)  
Other comprehensive income before reclassifications 8   135  
Amounts reclassified from accumulated other comprehensive income (187)   (627)  
Current period other comprehensive income, net (179)   (492)  
Ending balance at End of period $ (1,276)   $ (1,276)  
[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).