Condensed Consolidated Statements of Stockholders’ Deficit - USD ($) $ in Thousands	Common Stock	Preferred Stock	Treasury Stock	Additional Paid in Capital	Equity-Based Compensation	Foreign Currency Translation Adjustment	Unrealized Pension Actuarial Losses, net of tax	Accumulated Deficit	Total
Beginning balance at Dec. 31, 2017	$ 15	$ 1	$ (249)	$ 482,018	$ 34,085	$ (194)	$ (11,054)	$ (514,628)	$ (10,006)
Beginning balance (in shares) at Dec. 31, 2017	150,529,151	6,194,233	49,300
Increase (Decrease) in Stockholders’ Equity (Deficit)
Implementation of ASU								(1,418)	(1,418)
Net Loss								(23,994)	(23,994)
Equity-based compensation					959				959
Foreign currency translation adjustment						(268)			(268)
Net realized pension actuarial gains, net of tax							(403)		(403)
Preferred shares converted to common	1,986,767	(1,625,000)
Ending balance at Mar. 31, 2018	$ 15	$ 1	$ (249)	482,018	35,044	(462)	(11,457)	(540,040)	(35,130)
Ending balance (in shares) at Mar. 31, 2018	152,515,918	4,569,233	49,300
Beginning balance at Dec. 31, 2017	$ 15	$ 1	$ (249)	482,018	34,085	(194)	(11,054)	(514,628)	(10,006)
Beginning balance (in shares) at Dec. 31, 2017	150,529,151	6,194,233	49,300
Increase (Decrease) in Stockholders’ Equity (Deficit)
Net Loss									(78,116)
Foreign currency translation adjustment									(3,639)
Net realized pension actuarial gains, net of tax									363
Ending balance at Sep. 30, 2018	$ 15	$ 1	$ (5,148)	482,018	38,601	(3,833)	(10,691)	(594,162)	(93,199)
Ending balance (in shares) at Sep. 30, 2018	151,648,643	4,569,233	1,043,497
Beginning balance at Mar. 31, 2018	$ 15	$ 1	$ (249)	482,018	35,044	(462)	(11,457)	(540,040)	(35,130)
Beginning balance (in shares) at Mar. 31, 2018	152,515,918	4,569,233	49,300
Increase (Decrease) in Stockholders’ Equity (Deficit)
Net Loss								(25,182)	(25,182)
Equity-based compensation					1,936				1,936
Foreign currency translation adjustment						(879)			(879)
Net realized pension actuarial gains, net of tax							626		626
Shares repurchased			$ (3,479)						(3,479)
Shares repurchased (in shares)	(768,693)		768,693
Ending balance at Jun. 30, 2018	$ 15	$ 1	$ (3,728)	482,018	36,980	(1,341)	(10,831)	(565,222)	(62,108)
Ending balance (in shares) at Jun. 30, 2018	151,747,225	4,569,233	817,993
Increase (Decrease) in Stockholders’ Equity (Deficit)
Net Loss								(28,940)	(28,940)
Equity-based compensation					1,365				1,365
Foreign currency translation adjustment						(2,492)			(2,492)
Net realized pension actuarial gains, net of tax							140		140
Stock option exercised					256				256
Stock option exercised (in shares)	126,922
Shares repurchased			$ (1,420)						(1,420)
Shares repurchased (in shares)	(225,504)		225,504
Ending balance at Sep. 30, 2018	$ 15	$ 1	$ (5,148)	482,018	38,601	(3,833)	(10,691)	(594,162)	(93,199)
Ending balance (in shares) at Sep. 30, 2018	151,648,643	4,569,233	1,043,497
Beginning balance at Dec. 31, 2018	$ 15	$ 1	$ (10,342)	482,018	41,731	(6,565)	(9,301)	(678,563)	(181,006)
Beginning balance (in shares) at Dec. 31, 2018	150,142,955	4,569,233	2,549,185
Increase (Decrease) in Stockholders’ Equity (Deficit)
Net Loss								(29,907)	(29,907)
Equity-based compensation					2,798				2,798
Foreign currency translation adjustment						3,392			3,392
Net realized pension actuarial gains, net of tax							(224)		(224)
Ending balance at Mar. 31, 2019	$ 15	$ 1	$ (10,342)	482,018	44,529	(3,173)	(9,525)	(708,470)	(204,947)
Ending balance (in shares) at Mar. 31, 2019	150,142,955	4,569,233	2,549,185
Beginning balance at Dec. 31, 2018	$ 15	$ 1	$ (10,342)	482,018	41,731	(6,565)	(9,301)	(678,563)	(181,006)
Beginning balance (in shares) at Dec. 31, 2018	150,142,955	4,569,233	2,549,185
Increase (Decrease) in Stockholders’ Equity (Deficit)
Net Loss									(197,479)
Foreign currency translation adjustment									(1,221)
Net realized pension actuarial gains, net of tax									323
Ending balance at Sep. 30, 2019	$ 15	$ 1	$ (10,949)	482,018	48,411	(7,786)	(8,978)	(876,043)	(373,311)
Ending balance (in shares) at Sep. 30, 2019	150,698,864	4,419,233	2,787,147
Beginning balance at Mar. 31, 2019	$ 15	$ 1	$ (10,342)	482,018	44,529	(3,173)	(9,525)	(708,470)	(204,947)
Beginning balance (in shares) at Mar. 31, 2019	150,142,955	4,569,233	2,549,185
Increase (Decrease) in Stockholders’ Equity (Deficit)
Net Loss								(34,146)	(34,146)
Equity-based compensation					2,661				2,661
Foreign currency translation adjustment						(2,288)			(2,288)
Net realized pension actuarial gains, net of tax							256		256
RSU's vested (in shares)	102,092
Shares repurchased			$ (607)						(607)
Shares repurchased (in shares)	(237,962)		237,962
Ending balance at Jun. 30, 2019	$ 15	$ 1	$ (10,949)	482,018	47,190	(5,461)	(9,269)	(742,616)	(239,071)
Ending balance (in shares) at Jun. 30, 2019	150,007,085	4,569,233	2,787,147
Increase (Decrease) in Stockholders’ Equity (Deficit)
Net Loss								(133,427)	(133,427)
Equity-based compensation					1,444				1,444
Foreign currency translation adjustment						(2,325)			(2,325)
Net realized pension actuarial gains, net of tax							291		291
RSU's vested (in shares)	508,390
Withholding of employee taxes on vested RSUs					(223)				$ (223)
Preferred shares converted to common		(150,000)
Preferred shares converted to common	183,389
Shares repurchased (in shares)									0
Ending balance at Sep. 30, 2019	$ 15	$ 1	$ (10,949)	$ 482,018	$ 48,411	$ (7,786)	$ (8,978)	$ (876,043)	$ (373,311)
Ending balance (in shares) at Sep. 30, 2019	150,698,864	4,419,233	2,787,147