Comprehensive Income (Loss) - Components (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Loss:
Beginning balance	$ 136,504	$ 32,067	$ 162,266	$ (29,199)
Net other comprehensive income (loss)	(19,625)	31,983	(34,325)	30,297
Ending balance	118,880	182,125	118,880	182,125
Foreign currency translation adjustment
Accumulated Other Comprehensive Loss:
Beginning balance	(23,345)	(23,915)	(22,627)	(23,738)
Net other comprehensive income (loss)	116	182	(602)	5
Ending balance	(23,229)	(23,733)	(23,229)	(23,733)
Unrealized gain on marketable debt securities, net
Accumulated Other Comprehensive Loss:
Beginning balance	1,039	288	1,576	932
Net other comprehensive income (loss)	(160)	927	(697)	283
Ending balance	879	1,215	879	1,215
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Loss:
Beginning balance	(22,306)	(23,627)	(21,051)	(22,806)
Ending balance	$ (22,350)	$ (22,518)	$ (22,350)	$ (22,518)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details