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Stock-Based Compensation - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
AOCI Attributable to Parent [Roll Forward]        
Beginning balance     $ 105,665  
Net other comprehensive income (loss), June 30, 2017 $ (3,851) $ 2,455 (1,384) $ 3,083
Ending balance 102,431   102,431  
Foreign Currency Translation        
AOCI Attributable to Parent [Roll Forward]        
Beginning balance (8,803) (16,050) (11,247) (16,651)
Other comprehensive income (loss) before reclassifications (3,866) 2,440 (1,422) 3,041
Amounts reclassified from AOCI to Other income (expense), net 0 0 0 0
Net other comprehensive income (loss), June 30, 2017 (3,866) 2,440 (1,422) 3,041
Ending balance (12,669) (13,610) (12,669) (13,610)
Unrealized Gain (Loss) on Available for Sale Marketable Securities        
AOCI Attributable to Parent [Roll Forward]        
Beginning balance 0 0 (1) 0
Other comprehensive income (loss) before reclassifications 0 (3) 1 (3)
Amounts reclassified from AOCI to Other income (expense), net 0 0 0 0
Net other comprehensive income (loss), June 30, 2017 0 (3) 1 (3)
Ending balance 0 (3) 0 (3)
Unrealized Gain (Loss) on Available for Sale Marketable Securities        
AOCI Attributable to Parent [Roll Forward]        
Beginning balance (47) (131) (69) (158)
Other comprehensive income (loss) before reclassifications 3 (1) 10 4
Amounts reclassified from AOCI to Other income (expense), net 12 19 27 41
Net other comprehensive income (loss), June 30, 2017 15 18 37 45
Ending balance (32) (113) (32) (113)
Total Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent [Roll Forward]        
Beginning balance (8,850) (16,181) (11,317) (16,809)
Other comprehensive income (loss) before reclassifications (3,863) 2,436 (1,411) 3,042
Amounts reclassified from AOCI to Other income (expense), net 12 19 27 41
Net other comprehensive income (loss), June 30, 2017 (3,851) 2,455 (1,384) 3,083
Ending balance $ (12,701) $ (13,726) $ (12,701) $ (13,726)