CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Number of Common Shares outstanding	Treasury shares	Additional Paid-In Capital	Common Shares held in treasury	Retained earnings	Accumulated other comprehensive loss	Total
Balance at Dec. 31, 2018				$ 231,647	$ (8,880)	$ 146,251	$ (85,752)	$ 283,266
Common Stock, Share, Beginning Balance (in shares) at Dec. 31, 2018		28,488
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2018			478
Net income (loss)						9,657		9,657
Unrealized gain (loss) on derivatives, net							42	42
Currency translation adjustments							(3,804)	(3,804)
Issuance of Common Shares ( in shares)		305
Issuance of Common Shares ( in treasury shares)			(305)
Repurchased Common Shares for treasury, net					(1,883)			(1,883)
Repurchased Common Shares for treasury (in shares)		(98)
Repurchased Common Shares for treasury (in treasury shares)			98
Share-based compensation				480				480
Balance at Mar. 31, 2019				232,127	(10,763)	155,908	(89,514)	287,758
Common Stock, Share, Ending Balance (in shares) at Mar. 31, 2019		28,695
Treasury Stock, Shares, Ending Balance at Mar. 31, 2019			271
Balance at Dec. 31, 2018				231,647	(8,880)	146,251	(85,752)	283,266
Common Stock, Share, Beginning Balance (in shares) at Dec. 31, 2018		28,488
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2018			478
Net income (loss)								56,082
Unrealized gain (loss) on derivatives, net	[1]							(196)
Balance at Sep. 30, 2019				224,251	(50,836)	202,333	(99,168)	276,580
Common Stock, Share, Ending Balance (in shares) at Sep. 30, 2019		27,402
Treasury Stock, Shares, Ending Balance at Sep. 30, 2019			1,564
Balance at Mar. 31, 2019				232,127	(10,763)	155,908	(89,514)	287,758
Common Stock, Share, Beginning Balance (in shares) at Mar. 31, 2019		28,695
Treasury Stock, Shares, Beginning Balance at Mar. 31, 2019			271
Net income (loss)						39,764		39,764
Unrealized gain (loss) on derivatives, net							(112)	(112)
Currency translation adjustments							2,311	2,311
Issuance of Common Shares ( in shares)		31
Issuance of Common Shares ( in treasury shares)			(31)
Repurchased Common Shares for treasury, net					74			74
Repurchased Common Shares for treasury (in shares)		(9)
Repurchased Common Shares for treasury (in treasury shares)			9
Common Share repurchase program				(10,000)	(40,000)			(50,000)
Common Share repurchase program (in shares)		(1,350)
Common Share repurchase program (in treasury shares)			1,350
Share-based compensation				1,704				1,704
Balance at Jun. 30, 2019				223,831	(50,689)	195,672	(87,315)	281,499
Common Stock, Share, Ending Balance (in shares) at Jun. 30, 2019		27,367
Treasury Stock, Shares, Ending Balance at Jun. 30, 2019			1,599
Net income (loss)						6,661		6,661
Unrealized gain (loss) on derivatives, net							(126)	(126)	[1]
Currency translation adjustments							(11,727)	(11,727)
Issuance of Common Shares ( in shares)		62
Issuance of Common Shares ( in treasury shares)			(62)
Repurchased Common Shares for treasury, net					(147)			(147)
Repurchased Common Shares for treasury (in shares)		(27)
Repurchased Common Shares for treasury (in treasury shares)			27
Share-based compensation				420				420
Balance at Sep. 30, 2019				224,251	(50,836)	202,333	(99,168)	276,580
Common Stock, Share, Ending Balance (in shares) at Sep. 30, 2019		27,402
Treasury Stock, Shares, Ending Balance at Sep. 30, 2019			1,564
Balance at Dec. 31, 2019				225,607	(50,773)	206,542	(91,472)	$ 289,904
Common Stock, Share, Beginning Balance (in shares) at Dec. 31, 2019		27,408						27,408
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2019			1,558					1,558
Net income (loss)						3,490		$ 3,490
Unrealized gain (loss) on derivatives, net							(3,655)	(3,655)
Currency translation adjustments							(17,119)	(17,119)
Issuance of Common Shares ( in shares)		267
Issuance of Common Shares ( in treasury shares)			(267)
Repurchased Common Shares for treasury, net					4,769			4,769
Repurchased Common Shares for treasury (in shares)		(75)
Repurchased Common Shares for treasury (in treasury shares)			75
Common Share repurchase program				10,000	(14,995)			(4,995)
Common Share repurchase program (in shares)		(607)
Common Share repurchase program (in treasury shares)			607
Share-based compensation				(5,101)				(5,101)
Balance at Mar. 31, 2020				230,506	(60,999)	210,032	(112,246)	267,293
Common Stock, Share, Ending Balance (in shares) at Mar. 31, 2020		26,993
Treasury Stock, Shares, Ending Balance at Mar. 31, 2020			1,973
Balance at Dec. 31, 2019				225,607	(50,773)	206,542	(91,472)	$ 289,904
Common Stock, Share, Beginning Balance (in shares) at Dec. 31, 2019		27,408						27,408
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2019			1,558					1,558
Net income (loss)								$ (11,530)
Unrealized gain (loss) on derivatives, net	[1]							(1,423)
Balance at Sep. 30, 2020				232,060	(60,482)	195,012	(102,218)	$ 264,372
Common Stock, Share, Ending Balance (in shares) at Sep. 30, 2020		27,006						27,006
Treasury Stock, Shares, Ending Balance at Sep. 30, 2020			1,960					1,960
Balance at Mar. 31, 2020				230,506	(60,999)	210,032	(112,246)	$ 267,293
Common Stock, Share, Beginning Balance (in shares) at Mar. 31, 2020		26,993
Treasury Stock, Shares, Beginning Balance at Mar. 31, 2020			1,973
Net income (loss)						(21,734)		(21,734)
Unrealized gain (loss) on derivatives, net							1,210	1,210
Currency translation adjustments							1,821	1,821
Issuance of Common Shares ( in shares)		12
Issuance of Common Shares ( in treasury shares)			(12)
Repurchased Common Shares for treasury, net					360			360
Repurchased Common Shares for treasury (in shares)		(4)
Repurchased Common Shares for treasury (in treasury shares)			4
Share-based compensation				312				312
Balance at Jun. 30, 2020				230,818	(60,639)	188,298	(109,215)	249,262
Common Stock, Share, Ending Balance (in shares) at Jun. 30, 2020		27,001
Treasury Stock, Shares, Ending Balance at Jun. 30, 2020			1,965
Net income (loss)						6,714		6,714
Unrealized gain (loss) on derivatives, net							1,022	1,022	[1]
Currency translation adjustments							5,975	5,975
Issuance of Common Shares ( in shares)		6
Issuance of Common Shares ( in treasury shares)			(6)
Repurchased Common Shares for treasury, net					157			157
Repurchased Common Shares for treasury (in shares)		(1)
Repurchased Common Shares for treasury (in treasury shares)			1
Share-based compensation				1,242				1,242
Balance at Sep. 30, 2020				$ 232,060	$ (60,482)	$ 195,012	$ (102,218)	$ 264,372
Common Stock, Share, Ending Balance (in shares) at Sep. 30, 2020		27,006						27,006
Treasury Stock, Shares, Ending Balance at Sep. 30, 2020			1,960					1,960

[1] Net of tax expense (benefit) of $272 and $(34) for the three months ended September 30, 2020 and 2019, respectively. Net of tax benefit of $(378) and $(53) for the nine months ended September 30, 2020 and 2019, respectively.