Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Accumulated Other Comprehensive Loss    
Balance at beginning of period $ (5,302) $ (1,655)
Other comprehensive income (loss) before reclassifications 2,685 (529)
Amounts reclassified out of AOCL (193) (626)
Net current period activity 2,492 (1,155)
Balance at end of period (2,810) (2,810)
Foreign Currency Translation
    
Accumulated Other Comprehensive Loss    
Balance at beginning of period (5,514) (2,024)
Other comprehensive income (loss) before reclassifications 1,817 (1,673)
Net current period activity 1,817 (1,673)
Balance at end of period (3,697) (3,697)
Unrealized Gain on Foreign Currency Derivatives
    
Accumulated Other Comprehensive Loss    
Balance at beginning of period 256 373
Other comprehensive income (loss) before reclassifications 105 421
Amounts reclassified out of AOCL (193) (626)
Net current period activity (88) (205)
Balance at end of period 168 168
Unrealized Gain (Loss) on Available for Sale Securities
    
Accumulated Other Comprehensive Loss    
Balance at beginning of period (44) (4)
Other comprehensive income (loss) before reclassifications 763 723
Net current period activity 763 723
Balance at end of period $ 719 $ 719