CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net revenue	$ 817,190	$ 935,589	$ 982,223
Cost of revenue (excluding depreciation expense)	547,948	673,507	722,271
Gross profit	269,242	262,082	259,952
Other operating expenses	163,273	169,781	165,328
Bad debt expense	23,697	26,608	42,444
General and administrative expenses	39,625	38,798	42,474
Change in fair value of equity linked liabilities	3,587	(10,450)	0
Impairment of goodwill	0	0	251,850
Restructuring, acquisition, integration, and other expenses, net	12,662	15,859	24,405
Depreciation and amortization expense	27,725	22,025	22,864
Interest expense	52,072	37,572	36,938
Loss on extinguishment of debt	13,453	0	0
Loss (gain) on dispositions	581	(3,954)	0
Loss from continuing operations, before income taxes	(67,433)	(34,157)	(326,351)
Income tax benefit (expense)	4,130	(2,015)	21,532
Loss from continuing operations, net of income taxes	(63,303)	(36,172)	(304,819)
(Loss) income from discontinued operations, net of income taxes	(893)	(6,593)	4,691
Net loss	(64,196)	(42,765)	(300,128)
Accrued dividends on preferred stock	(9,376)	(8,392)	(6,120)
Deemed dividends on preferred stock	(701)	(692)	(3,690)
Loss attributable to common stockholders	$ (74,273)	$ (51,849)	$ (309,938)
Loss per common share:
Loss from continuing operations, basic and diluted (in USD per share)	$ (0.59)	$ (0.48)	$ (4.58)
(Loss) Income from discontinued operations, basic and diluted (in USD per share)	(0.01)	(0.07)	0.07
Net loss, basic and diluted (in USD per share)	$ (0.60)	$ (0.55)	$ (4.51)
Weighted average common shares outstanding, basic and diluted (in shares)	123,791	93,740	68,710