Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income (loss)	$ 18,875	$ (13,464)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Early extinguishment of debt	7,753
Equity in (income) loss of affiliated companies	250	1,160
Deferred income tax provision (benefit)	3,458	(7,920)
Gain on life insurance proceeds	(4,000)
Provision for losses on receivables	92
Depreciation and amortization	68,687	68,119
Losses on sale of property and equipment	4,709	903
Share based compensation	1,356	381
Original issue discount and deferred financing amortization	1,559	2,209
Interest paid-in-kind	(7,516)	953
Purchase commitment interest (income) expense	8	(614)
Changes in operating assets and liabilities:
Receivables	(30,102)	(21,543)
Prepaid insurance and licenses	(9,754)	(6,069)
Operating supplies	(96)	135
Other assets	(4,190)	(1,928)
Accounts payable and other accrued liabilities	(11,531)	9,618
Accrued wages and benefits	5,304	1,579
Net cash provided by operating activities	44,862	33,519
Investing activities
Payments for purchases of property and equipment	(125,556)	(234,372)
Proceeds from sales of property and equipment	36,915	25,516
Acquisition of business		(2,219)
Other	(500)	(758)
Net cash used in investing activities	(89,141)	(211,833)
Financing activities
Borrowings under lines of credit	219,332	300,327
Payments under lines of credit	(248,665)	(266,408)
Borrowings under long-term debt	289,943	224,260
Payments of long-term debt	(464,375)	(85,065)
Payments of financing costs	(4,162)	(461)
Proceeds from IPO, net of issuance costs	246,685
Payments of long-term consideration for business acquisition	(1,010)
Repurchase of membership units	(217)	(400)
Book overdraft	3,626	5,053
Net cash provided by financing activities	41,157	177,306
Net change in cash and cash equivalents	(3,122)	(1,008)
Cash and cash equivalents:
Beginning of year	9,232	3,278
End of period	6,110	2,270
Supplemental disclosure of cash flow information
Cash paid during the year for interest	42,306	32,972
Cash paid during the year for income taxes	1,368	353
Supplemental disclosure of significant noncash investing and financing activities
Lease conversion		34,169
Assumption of debt		5,377
Uncollected proceeds from asset sales	231	1,000
Uncollected proceeds from corporate owned life insurance	4,225
Capital Lease Obligations [Member]
Supplemental disclosure of significant noncash investing and financing activities
Capital lease extinguishments	$ 1,096	$ 96