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Stock-Based Compensation - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
AOCI Attributable to Parent [Roll Forward]    
Beginning balance $ 105,665  
Net other comprehensive income during the period 2,467 $ 628
Ending balance 106,834  
Foreign Currency Translation    
AOCI Attributable to Parent [Roll Forward]    
Beginning balance (11,247) (16,651)
Other comprehensive income before reclassifications 2,444 601
Amounts reclassified from AOCI to Other income (expense), net 0 0
Net other comprehensive income during the period 2,444 601
Ending balance (8,803) (16,050)
Unrealized Gain (Loss) on Available for Sale Marketable Securities    
AOCI Attributable to Parent [Roll Forward]    
Beginning balance (1) 0
Other comprehensive income before reclassifications 1 0
Amounts reclassified from AOCI to Other income (expense), net 0 0
Net other comprehensive income during the period 1 0
Ending balance 0 0
Interest Rate Swaps    
AOCI Attributable to Parent [Roll Forward]    
Beginning balance (69) (158)
Other comprehensive income before reclassifications 7 5
Amounts reclassified from AOCI to Other income (expense), net 15 22
Net other comprehensive income during the period 22 27
Ending balance (47) (131)
Total Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent [Roll Forward]    
Beginning balance (11,317) (16,809)
Other comprehensive income before reclassifications 2,452 606
Amounts reclassified from AOCI to Other income (expense), net 15 22
Net other comprehensive income during the period 2,467 628
Ending balance $ (8,850) $ (16,181)