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Accumulated Other Comprehensive Income ("AOCI") (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Total changes in AOCI by component, net of tax    
Beginning Balance $ (6,324)  
Beginning Balance of Currency Translation Adjustment (7,340)  
Beginning balance of accumulated other comprehensive loss net of tax (13,664)  
Other comprehensive income before reclassifications, Defined benefit pension plan activity 0  
Other comprehensive income before reclassifications, Currency translation adjustment 420  
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial loss, Defined benefit pension plan activity 77  
Amortization of defined benefit pension actuarial loss, Currency Translation Adjustment 0  
Amortization of defined benefit pension actuarial loss, Total 77  
Net current period other comprehensive income, Defined benefit pension plan activity 77  
Net current period other comprehensive income, Currency translation adjustment 420 5,273
Net current period other comprehensive income 497 5,382
Ending Balance (6,247)  
Ending Balance of Currency Translation Adjustment (6,920)  
Ending balance of accumulated other comprehensive loss net of tax $ (13,167)