General (Details 4) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Components of accumulated other comprehensive loss (AOCL), net of tax  
Balance at beginning of period $ (1,655)
Other comprehensive income (loss) before reclassifications (1,542)
Amounts reclassified out of AOCL (141)
Net current period activity (1,683)
Balance at end of period (3,338)
Foreign Currency Translation
  
Components of accumulated other comprehensive loss (AOCL), net of tax  
Balance at beginning of period (2,024)
Other comprehensive income (loss) before reclassifications (1,722)
Net current period activity (1,722)
Balance at end of period (3,746)
Unrealized Gain on Foreign Currency Derivatives
  
Components of accumulated other comprehensive loss (AOCL), net of tax  
Balance at beginning of period 373
Other comprehensive income (loss) before reclassifications 94
Amounts reclassified out of AOCL (141)
Net current period activity (47)
Balance at end of period 326
Unrealized Gain (Loss) on Available for Sale Securities
  
Components of accumulated other comprehensive loss (AOCL), net of tax  
Balance at beginning of period (4)
Other comprehensive income (loss) before reclassifications 86
Net current period activity 86
Balance at end of period $ 82