CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net loss	$ (35,127)	$ (313,948)	$ (81,872)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	103,449	97,107	107,712
Gain on disposal of property and equipment	(2,726)	(97)	(760)
Gain realized on previously held interest in Rockwater	(1,210)
Bad debt expense	1,542	2,385	3,179
Amortization of debt issuance costs	4,031	3,435	576
Equity-based compensation	7,691	317	692
Impairment of goodwill and other intangible assets		138,666	21,366
Impairment of property and equipment	0	60,026
Loss on the sale of business unit			972
Other operating items, net	(353)	(1,619)	(2,340)
Changes in operating assets and liabilities
Accounts receivable	(100,485)	1,290	140,426
Prepaid expenses and other assets	(2,177)	1,224	3,112
Accounts payable and accrued liabilities	22,466	16,345	(41,064)
Net cash (used in) provided by operating activities	(2,899)	5,131	151,999
Cash flows from investing activities
Acquisitions, net of cash received	(65,488)
Proceeds received from investments			830
Purchase of property, equipment, and intangible assets	(98,722)	(36,290)	(54,076)
Proceeds received from sale of business unit			400
Proceeds received from sale of property and equipment	7,479	9,335	14,143
Net cash used in investing activities	(156,731)	(26,955)	(38,703)
Cash flows from financing activities
Proceeds from 144A Offering, net of underwriter fees and expenses		297,248
Proceeds from revolving line of credit and issuance of long-term debt	109,000	27,500	5,000
Payments on long-term debt	(111,000)	(298,000)	(107,000)
Payment of debt issuance costs	(3,442)	(4,497)	(1,192)
Proceeds from initial public offering	140,070
Payments incurred for initial public offering	(11,566)
Purchase of noncontrolling interests		(348)
(Distributions to) proceeds from noncontrolling interests	(368)	138	92
Purchase of treasury stock	(297)
Member contributions (distributions)		23,519	(4,248)
Net cash provided by (used in) financing activities	122,397	45,560	(107,348)
Effect of exchange rate changes on cash	(34)		75
Net (decrease) increase in cash and cash equivalents	(37,267)	23,736	6,023
Cash and cash equivalents, beginning of period	40,041	16,305	10,282
Cash and cash equivalents, end of period	2,774	40,041	16,305
Supplemental cash flow disclosure:
Cash paid for interest	1,999	12,773	10,584
Cash (refunded) paid for taxes	(54)	(192)	2,262
Supplemental disclosure of noncash investing activities:
Capital expenditures included in accounts payable and accrued liabilities	$ 11,137	$ 1,563	$ 936