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Unaudited Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance at Dec. 31, 2020	$ 757,631	$ (9,450)	$ 733	$ 1,122,945	$ (25,683)	$ 329,327	$ 16,233	$ (71,385)	$ (623,989)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(31,081)					(31,081)
Currency translation adjustments (excluding intercompany advances)	1,624							1,624
Currency translation adjustments on intercompany advances	7							7
Stock-based compensation expense	4,703		6	4,697
Surrender of stock to settle taxes on stock awards	(1,500)								(1,500)
Ending balance at Jun. 30, 2021	721,934		739	1,101,959		314,479		(69,754)	(625,489)
Beginning balance at Mar. 31, 2021	732,162	$ 0	738	1,100,077	$ 0	329,750	$ 0	(72,914)	(625,489)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(15,271)					(15,271)
Currency translation adjustments (excluding intercompany advances)	556							556
Currency translation adjustments on intercompany advances	2,604							2,604
Stock-based compensation expense	1,883		1	1,882
Surrender of stock to settle taxes on stock awards	0								0
Ending balance at Jun. 30, 2021	721,934		739	1,101,959		314,479		(69,754)	(625,489)
Beginning balance at Dec. 31, 2021	695,826		739	1,105,135		281,567		(66,031)	(625,584)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(14,568)					(14,568)
Currency translation adjustments (excluding intercompany advances)	(13,208)							(13,208)
Currency translation adjustments on intercompany advances	1,389							1,389
Stock-based compensation expense	3,504		8	3,496
Surrender of stock to settle taxes on stock awards	(1,002)								(1,002)
Ending balance at Jun. 30, 2022	671,941		747	1,108,631		266,999		(77,850)	(626,586)
Beginning balance at Mar. 31, 2022	688,108		746	1,106,963		272,143		(65,170)	(626,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(5,144)					(5,144)
Currency translation adjustments (excluding intercompany advances)	(9,628)							(9,628)
Currency translation adjustments on intercompany advances	(3,052)							(3,052)
Stock-based compensation expense	1,669		1	1,668
Surrender of stock to settle taxes on stock awards	(12)								(12)
Ending balance at Jun. 30, 2022	$ 671,941		$ 747	$ 1,108,631		$ 266,999		$ (77,850)	$ (626,586)

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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, excluding intercompany advances.

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