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Accumulated Other Comprehensive Loss - (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ 704,507	$ 764,338	$ 704,507	$ 764,338	$ 721,934	$ 757,631	$ 778,869	$ 1,223,967
Currency translation adjustments	$ (5,838)	$ 3,357	$ (4,207)	$ (12,664)
United Kingdom, Pounds
Accumulated Other Comprehensive Income (Loss) [Line Items]
Exchange rate strengthened (weakened)	(1.00%)	(2.00%)	(1.00%)	(2.00%)
Brazil, Brazil Real
Accumulated Other Comprehensive Income (Loss) [Line Items]
Exchange rate strengthened (weakened)	(5.00%)	(29.00%)	(5.00%)	(29.00%)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ (75,592)	$ (80,410)	$ (75,592)	$ (80,410)	$ (69,754)	$ (71,385)	$ (83,767)	$ (67,746)

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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, attributable to parent entity.

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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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