Condensed Consolidated Statements of Shareholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Unrecognized Gains (Losses) on Derivative Instruments	Pension Obligations	Cumulative Translation Adjustment	Retained Earnings
Beginning of period at Dec. 31, 2018	$ 373,265	$ 87,723	$ (3,205)	$ (3,000)	$ (99,290)	$ 391,037
Beginning of the period (in shares) at Dec. 31, 2018		25,019,237
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	2,589					2,589
Change in unrecognized gains/losses on derivative instruments, net of tax	(1,520)		(1,520)
Change in employee benefit plans, net of taxes	122			122
Net foreign currency translation adjustment	(21,459)				(21,459)
Common stock issued, net of shares withheld for employee taxes (in shares)		108,921
Stock-based compensation	3,587	$ 3,587
Cash dividend declared	(4,597)					(4,597)
Redeemable preferred 9% dividend, participating dividend and accretion	(23,275)					(23,275)
European non-controlling redeemable equity dividend	(496)					(496)
End of period at Sep. 30, 2019	328,216	$ 91,310	(4,725)	(2,878)	(120,749)	365,258
End of the period (in shares) at Sep. 30, 2019		25,128,158
Beginning of period at Dec. 31, 2018	373,265	$ 87,723	(3,205)	(3,000)	(99,290)	391,037
Beginning of the period (in shares) at Dec. 31, 2018		25,019,237
End of period at Dec. 31, 2019	$ 251,690	$ 93,331	9,951	(5,571)	(104,458)	258,437
End of the period (in shares) at Dec. 31, 2019	25,128,158	25,128,158
Beginning of period at Jun. 30, 2019	$ 371,190	$ 89,532	3,577	(2,917)	(98,606)	379,604
Beginning of the period (in shares) at Jun. 30, 2019		25,114,598
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(6,631)					(6,631)
Change in unrecognized gains/losses on derivative instruments, net of tax	(8,302)		(8,302)
Change in employee benefit plans, net of taxes	39			39
Net foreign currency translation adjustment	(22,143)				(22,143)
Common stock issued, net of shares withheld for employee taxes (in shares)		13,560
Stock-based compensation	1,778	$ 1,778
Cash dividend declared	(15)					(15)
Redeemable preferred 9% dividend, participating dividend and accretion	(7,587)					(7,587)
European non-controlling redeemable equity dividend	(113)					(113)
End of period at Sep. 30, 2019	328,216	$ 91,310	(4,725)	(2,878)	(120,749)	365,258
End of the period (in shares) at Sep. 30, 2019		25,128,158
Beginning of period at Dec. 31, 2019	$ 251,690	$ 93,331	9,951	(5,571)	(104,458)	258,437
Beginning of the period (in shares) at Dec. 31, 2019	25,128,158	25,128,158
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	$ (222,154)					(222,154)
Change in unrecognized gains/losses on derivative instruments, net of tax	(25,316)		(25,316)
Change in employee benefit plans, net of taxes	171			171
Net foreign currency translation adjustment	(9,706)				(9,706)
Common stock issued, net of shares withheld for employee taxes (in shares)		463,772
Stock-based compensation	727	$ 727
Redeemable preferred 9% dividend, participating dividend and accretion	(23,811)					(23,811)
European non-controlling redeemable equity dividend	(152)					(152)
End of period at Sep. 30, 2020	$ (28,551)	$ 94,058	(15,365)	(5,400)	(114,164)	12,320
End of the period (in shares) at Sep. 30, 2020	25,591,930	25,591,930
Beginning of period at Jun. 30, 2020	$ (53,176)	$ 93,541	(20,048)	(5,457)	(130,548)	9,336
Beginning of the period (in shares) at Jun. 30, 2020		25,591,930
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	11,146					11,146
Change in unrecognized gains/losses on derivative instruments, net of tax	4,683		4,683
Change in employee benefit plans, net of taxes	57			57
Net foreign currency translation adjustment	16,384				16,384
Stock-based compensation	517	$ 517
Redeemable preferred 9% dividend, participating dividend and accretion	(8,056)					(8,056)
European non-controlling redeemable equity dividend	(106)					(106)
End of period at Sep. 30, 2020	$ (28,551)	$ 94,058	$ (15,365)	$ (5,400)	$ (114,164)	$ 12,320
End of the period (in shares) at Sep. 30, 2020	25,591,930	25,591,930