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Accumulated Other Comprehensive (Loss) / Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in accumulated other comprehensive income (loss)      
Beginning balance $ 76,077 $ 188,909 $ 463,587
Other comprehensive (loss) income 6,009 (3,057) (7,452)
Tax effect (961) 179 442
Ending balance 43,282 76,077 188,909
Accumulated Other Comprehensive Income (Loss)      
Changes in accumulated other comprehensive income (loss)      
Beginning balance (33,261) (30,383) (23,373)
Ending balance (28,213) (33,261) (30,383)
Foreign currency      
Changes in accumulated other comprehensive income (loss)      
Beginning balance (28,204) (26,436) (20,284)
Other comprehensive (loss) income 2,128 (1,768) (6,152)
Tax effect 0 0
Ending balance (26,076) (28,204) (26,436)
Unrealized loss on intra-entity foreign currency transactions      
Changes in accumulated other comprehensive income (loss)      
Beginning balance (4,306) (3,906) (3,085)
Other comprehensive (loss) income 3,130 (579) (1,263)
Tax effect (961) 179 442
Ending balance (2,137) (4,306) (3,906)
Unrealized holding gains (losses) on marketable debt securities      
Changes in accumulated other comprehensive income (loss)      
Beginning balance (751) (41) (4)
Other comprehensive (loss) income 751 (710) (37)
Tax effect 0 0 0
Ending balance $ 0 $ (751) $ (41)