v2.4.0.6
New Accounting Pronouncements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net of tax changes in accumulated other comprehensive income by component    
Balance at the beginning of the period $ 3,022 $ 2,318
Other comprehensive (loss) income:    
Foreign currency translation adjustment (391) 288
Unrealized holding losses on corporate debt securities (99) (70)
Balance at the end of the period 2,532 2,536
Foreign Currency
    
Net of tax changes in accumulated other comprehensive income by component    
Balance at the beginning of the period 1,628 1,202
Other comprehensive (loss) income:    
Foreign currency translation adjustment (391) 288
Balance at the end of the period 1,237 1,490
Available for sale securities
    
Net of tax changes in accumulated other comprehensive income by component    
Balance at the beginning of the period 1,394 1,116
Other comprehensive (loss) income:    
Unrealized holding losses on corporate debt securities (99) (70)
Balance at the end of the period $ 1,295 $ 1,046