Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Consolidated Statements of Operations
Revenue	$ 294,312	$ 279,229	$ 293,009	$ 300,056	$ 314,109	$ 305,280	$ 307,722	$ 365,451	$ 1,166,606	$ 1,292,562	$ 1,562,337
Cost of revenue (exclusive of depreciation and amortization)	235,697	211,731	209,080	232,587	254,995	234,222	241,788	292,539	889,095	1,023,544	1,224,735
Selling, general and administrative expenses (exclusive of depreciation and amortization)	48,262	43,244	36,390	41,885	45,879	42,837	47,014	50,374	169,781	186,104	198,864
Depreciation and amortization	19,037	19,094	19,420	19,599	25,826	22,095	22,847	23,185	77,150	93,953	100,903
Impairment of goodwill and other intangible assets											349,557
Related party expense	1,992	2,744	2,748	1,707	1,324	1,360	1,146	1,551	9,191	5,381	9,501
Operating profit (loss)	(10,676)	2,416	25,371	4,278	(13,915)	4,766	(5,073)	(2,198)	21,389	(16,420)	(321,223)
Other expense (income), net:
Interest expense, net	40,293	41,757	42,867	43,131	44,238	43,612	44,440	41,588	168,048	173,878	163,449
Debt modification and extinguishment costs (gain), net	11,381	(28,070)			9,589				(16,689)	9,589	1,404
Sundry expense (income), net	801	136	(787)	213	98	(434)	(899)	1,082	363	(153)	969
Other expense (income), net	(768)	366	651	152	10,867	(10,414)	(584)	(34,657)	401	(34,788)	14,429
Net loss before income taxes	(62,383)	(11,773)	(17,360)	(39,218)	(78,707)	(27,998)	(48,030)	(10,211)	(130,734)	(164,946)	(501,474)
Income tax expense	(8,226)	(1,441)	(2,007)	18	(10,144)	(320)	(661)	(2,459)	(11,656)	(13,584)	(7,642)
Net loss	(70,609)	(13,214)	(19,367)	(39,200)	(88,851)	(28,318)	(48,691)	(12,670)	(142,390)	(178,530)	(509,116)
Cumulative dividends for Series A Preferred Stock	(852)	(822)	(798)		(915)	(976)	(858)		(1,576)	(1,309)	(3,309)
Net loss attributable to common stockholders	$ (71,461)	$ (14,036)	$ (20,165)	$ (38,304)	$ (89,766)	$ (29,294)	$ (49,549)	$ (11,230)	$ (143,966)	$ (179,839)	$ (512,425)
Basic (in dollars per share)	$ (0.34)	$ (0.09)	$ (0.33)	$ (0.76)	$ (1.82)	$ (0.60)	$ (1.01)	$ (0.23)	$ (1.22)	$ (3.66)	$ (10.55)
Diluted (in dollars per share)	$ (0.34)	$ (0.09)	$ (0.33)	$ (0.76)	$ (1.82)	$ (0.60)	$ (1.01)	$ (0.23)	$ (1.22)	$ (3.66)	$ (10.55)