Significant Accounting Policies - Revisions to Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Currency translation adjustment	$ (13,308)	$ (46,902)	$ 49,242
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	(5,795)	(6,172)	4,874
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 59,725	64,277	182,545
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Currency translation adjustment		(47,397)	49,600
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest		(4,804)	4,874
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		67,948	180,235
Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Currency translation adjustment		495	(358)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest		1,368	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ (3,671)	$ 2,310

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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