Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income (loss)	$ 26,106	$ (3,937)	$ (15,974)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Early extinguishment of debt	7,753
Impairments of assets held for sale and equity method investments	12,497
Equity in loss of affiliated companies	381	1,350	3,202
Gain on life insurance proceeds	(4,000)
Deferred income tax provision (benefit)	5,691	(20,156)	(12,245)
Provision for losses on receivables	104		9
Depreciation and amortization	90,831	91,340	65,775
Losses on sale of equipment	7,123	2,029	5,822
Share based compensation	2,248	673	520
Original issue discount and deferred financing amortization	1,728	3,791	5,517
Interest paid-in-kind	(7,516)	1,452	1,817
Gain on sale of Xpress Global Systems		(1,026)
Purchase commitment interest (income) expense	(192)	(698)	883
Changes in operating assets and liabilities:
Receivables	(8,972)	(32,051)	13,114
Prepaid insurance and licenses	(4,006)	45	(1,322)
Operating supplies	725	(510)	498
Other assets	(3,438)	(529)	(1,857)
Accounts payable and other accrued liabilities	(21,020)	41,930	10,291
Accrued wages and benefits	6,304	1,691	939
Net cash provided by operating activities	112,347	85,394	76,989
Investing activities
Payments for purchases of property and equipment	(223,939)	(240,417)	(54,710)
Proceeds from sales of property and equipment	55,370	32,183	43,723
Proceeds on life insurance	2,980
Acquisition of business		(2,219)
Other	(500)	(758)	(360)
Net cash used in investing activities	(166,089)	(211,211)	(11,347)
Financing activities
Borrowings under lines of credit	292,332	387,973	344,681
Payments under lines of credit	(321,665)	(358,640)	(344,680)
Borrowings under long-term debt	362,013	224,102	47,847
Payments of long-term debt	(504,180)	(118,834)	(102,126)
Payments of financing costs and original issue discount	(4,166)	(5,844)	(3,780)
Proceeds from issuance of 16,668,000 shares, net of expenses	246,616
Payments of long-term consideration for business acquistion	(1,010)
Settlement of forward contract			(2,200)
Repurchase of membership units	(217)	(523)	(299)
Book overdraft	(3,537)	3,537	(4,150)
Net cash provided by (used in) financing activities	66,186	131,771	(64,707)
Cash included in assets held for sale	(11,784)
Net change in cash and cash equivalents	660	5,954	935
Cash and cash equivalents:
Beginning of year	9,232	3,278	2,343
End of year	9,892	9,232	3,278
Supplemental disclosure of cash flow information
Cash paid during the year for interest	47,406	44,073	33,696
Cash paid (refunded) during the year for income taxes	1,603	(208)	1,834
Supplemental disclosure of significant noncash investing and financing activities
Lease conversion		34,169
Capital lease additions	439	1,505
Assumption of debt		5,377
Property and equipment amounts accrued in accounts payable	1,213	1,196
Financing costs accrued in accounts payable		1,162
Uncollected proceeds from asset sales	2,671	424	879
Capital Lease Obligations [Member]
Supplemental disclosure of significant noncash investing and financing activities
Capital lease extinguishments	$ 1,146	$ 222	$ 6,035