Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Ordinary Shares	Treasury Shares	Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018		130,440,126	54,608
Beginning balance at Dec. 31, 2018	$ 839,841	$ 14,161	$ (394)	$ 992,297	$ (3,658)	$ (162,565)
Shareholders' Equity
Net (loss) income	42,988					42,988
Other comprehensive income (loss)	(6,009)				(6,009)
Share-based compensation, net of tax withholdings (in shares)		249,044
Share-based compensation, net of tax withholdings	2,748	$ 29		2,719
Repurchase of ordinary shares (in shares)		(198,179)	(198,179)
Repurchase of ordinary shares	(1,522)		$ (1,522)
Ending balance (in shares) at Mar. 31, 2019		130,490,991	252,787
Ending balance at Mar. 31, 2019	878,046	$ 14,190	$ (1,916)	995,016	(9,667)	(119,577)
Beginning balance (in shares) at Dec. 31, 2018		130,440,126	54,608
Beginning balance at Dec. 31, 2018	839,841	$ 14,161	$ (394)	992,297	(3,658)	(162,565)
Shareholders' Equity
Net (loss) income	44,028
Other comprehensive income (loss)	(20,818)
Ending balance (in shares) at Jun. 30, 2019		130,327,895	557,374
Ending balance at Jun. 30, 2019	863,891	$ 14,205	$ (4,316)	997,015	(24,476)	(118,537)
Beginning balance (in shares) at Mar. 31, 2019		130,490,991	252,787
Beginning balance at Mar. 31, 2019	878,046	$ 14,190	$ (1,916)	995,016	(9,667)	(119,577)
Shareholders' Equity
Net (loss) income	1,040					1,040
Other comprehensive income (loss)	(14,809)				(14,809)
Share-based compensation, net of tax withholdings (in shares)		141,491
Share-based compensation, net of tax withholdings	2,014	$ 15		1,999
Repurchase of ordinary shares (in shares)		(304,587)	(304,587)
Repurchase of ordinary shares	(2,400)		$ (2,400)
Ending balance (in shares) at Jun. 30, 2019		130,327,895	557,374
Ending balance at Jun. 30, 2019	863,891	$ 14,205	$ (4,316)	997,015	(24,476)	(118,537)
Beginning balance (in shares) at Dec. 31, 2019		129,121,576	1,846,095
Beginning balance at Dec. 31, 2019	809,651	$ 14,215	$ (14,088)	1,001,088	(24,642)	(166,922)
Shareholders' Equity
Net (loss) income	(22,556)					(22,556)
Other comprehensive income (loss)	(15,103)				(15,103)
Share-based compensation, net of tax withholdings (in shares)		493,226	4,500
Share-based compensation, net of tax withholdings	3,189	$ 55	$ (34)	3,168
Repurchase of ordinary shares (in shares)		(340,109)	(340,109)
Repurchase of ordinary shares	(2,500)		$ (2,500)
Ending balance (in shares) at Mar. 31, 2020		129,274,693	2,190,704
Ending balance at Mar. 31, 2020	772,681	$ 14,270	$ (16,622)	1,004,256	(39,745)	(189,478)
Beginning balance (in shares) at Dec. 31, 2019		129,121,576	1,846,095
Beginning balance at Dec. 31, 2019	809,651	$ 14,215	$ (14,088)	1,001,088	(24,642)	(166,922)
Shareholders' Equity
Net (loss) income	(110,014)
Other comprehensive income (loss)	(12,025)
Ending balance (in shares) at Jun. 30, 2020		134,485,477	2,198,796
Ending balance at Jun. 30, 2020	710,558	$ 14,861	$ (16,642)	1,025,942	(36,667)	(276,936)
Beginning balance (in shares) at Mar. 31, 2020		129,274,693	2,190,704
Beginning balance at Mar. 31, 2020	772,681	$ 14,270	$ (16,622)	1,004,256	(39,745)	(189,478)
Shareholders' Equity
Net (loss) income	(87,458)					(87,458)
Other comprehensive income (loss)	3,078				3,078
Share-based compensation, net of tax withholdings (in shares)		332,735	8,092
Share-based compensation, net of tax withholdings	$ 2,699	$ 38	$ (20)	2,681
Repurchase of ordinary shares (in shares)	0
Equity issuance, net (see Note 8) (in shares)		4,878,049
Equity issuance, net (see Note 8)	$ 19,558	$ 553		19,005
Ending balance (in shares) at Jun. 30, 2020		134,485,477	2,198,796
Ending balance at Jun. 30, 2020	$ 710,558	$ 14,861	$ (16,642)	$ 1,025,942	$ (36,667)	$ (276,936)