CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net revenue	$ 708,903	$ 817,190	$ 935,589
Cost of revenue (excluding depreciation expense)	465,865	547,948	673,507
Gross profit	243,038	269,242	262,082
Operating expenses:
Service location operating expenses	154,813	163,273	169,781
General and administrative expenses	47,264	39,625	38,798
Depreciation and amortization expense	23,601	27,725	22,025
Restructuring, acquisition, integration, and other expenses	6,457	12,662	15,859
Bad debt expense	0	23,697	26,608
Total operating expenses	232,135	266,982	273,071
Operating income (loss)	10,903	2,260	(10,989)
Other expense:
Interest expense, net	57,433	52,072	37,572
Change in fair value of equity linked liabilities	4,836	3,587	(10,450)
Loss (gain) on dispositions	(342)	581	(3,954)
Loss on extinguishment of debt	0	13,453	0
Total other expense	61,927	69,693	23,168
Loss from continuing operations, before income taxes	(51,024)	(67,433)	(34,157)
Income tax benefit (expense)	(568)	4,130	(2,015)
Loss from continuing operations	(51,592)	(63,303)	(36,172)
Loss from discontinued operations, net of income taxes	(101)	(893)	(6,593)
Net loss	(51,693)	(64,196)	(42,765)
Accrued dividends on preferred stock	(11,210)	(10,077)	(9,084)
Loss attributable to common stockholders	$ (62,903)	$ (74,273)	$ (51,849)
Loss per common share:
Loss from continuing operations, basic and diluted (in USD per share)	$ (0.49)	$ (0.59)	$ (0.48)
Loss from discontinued operations, basic and diluted (in USD per share)	0.00	(0.01)	(0.07)
Loss per common share, basic and diluted (in USD per share)	$ (0.49)	$ (0.60)	$ (0.55)
Weighted average number of common shares outstanding:
Basic and diluted (in shares)	127,942	123,791	93,740