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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Changes in accumulated other comprehensive income [Roll Forward]        
Foreign currency translation adjustments, beginning balance $ 3,851   $ 4,663  
Foreign currency translation adjustments, other comprehensive income before reclassifications (940)   (1,752)  
Foreign currency translation adjustments, amounts reclassified from accumulated other comprehensive income 0   0  
Foreign currency translation adjustments, current period other comprehensive income, net (940) (903) (1,752) 166
Foreign currency translation adjustments, ending balance 2,911   2,911  
Unrecognized pension and postretirement benefit costs (credit), beginning balance (983)   (784)  
Unrecognized pension and postretirement benefit costs (credit), other comprehensive income before reclassifications 139   127  
Unrecognized pension and postretirement benefit costs (credit), amounts reclassified from accumulated other comprehensive income (253)   (440)  
Unrecognized pension and postretirement benefit costs (credit), current period other comprehensive income, net (114)   (313)  
Unrecognized pension and postretirement benefit costs (credit), ending balance (1,097)   (1,097)  
Accumulated other comprehensive income, beginning period 2,868   3,879  
Other comprehensive income before reclassifications (801)   (1,625)  
Amounts reclassified from accumulated other comprehensive income (253)   (440)  
Current period other comprehensive income, net (1,054)   (2,065)  
Accumulated other comprehensive income, ending period 1,814   1,814  
Amortization of pension and postretirement benefit plans [Abstract]        
Prior service benefit (1,080) [1] (1,196) (2,160) [1] (2,392)
Unrecognized loss 776 [1] 835 1,561 [1] 1,548
Amount reclassified from accumulated other comprehensive income, total before income tax (304)   (599)  
Amount reclassified from accumulated other comprehensive income, income tax benefit 51 (37) 159 149
Total reclassifications for the period $ (253)   $ (440)  
[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).