Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net (loss) income	$ (17,055)	$ 7,315
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Provision for accounts receivable	3,211	13
Reversal of gain on sales to equity method investee	(77)	(7)
Depreciation and amortization	51,281	61,250
Impairment of property and equipment	26,569	0
Amortization of deferred financing fees	154	110
Deferred income tax (benefit) expense	(7,138)	4,632
Income tax benefit arising from restricted share vesting and stock options exercised	81	4
Stock-based compensation expense	1,120	426
Income from equity method investment	(971)	(7,548)
Return on investment in affiliated company	0	1,225
Gain on disposition of property and equipment	(7,019)	(2,137)
Gain on disposition of reportable segment	(3,720)	0
Return on investment in available-for-sale securities	0	(4)
Changes in operating assets and liabilities:
Receivables and advances	(72,413)	(9,099)
Prepaid expenses and other assets	5,756	(977)
Inventory and supplies	914	(111)
Insurance and claims accrual	30,428	539
Accounts payable and accrued expenses	13,836	(15,828)
Net cash flows provided by operating activities	24,957	39,803
Purchase of available-for-sale securities	(319)	(1,380)
Acquisition of property and equipment	(63,614)	(129,403)
Proceeds from disposition of reportable segment	108,375	0
Proceeds from disposition of property and equipment	86,555	31,235
Net cash flows provided by (used in) investing activities	130,997	(99,548)
Cash flows from financing activities:
Change in checks outstanding in excess of bank balances	(592)	(664)
Proceeds from issuance of notes payable	65,457	102,796
Repayments of notes payable	(215,750)	(30,538)
Repayments of finance lease obligations	(17,372)	(4,232)
Proceeds under revolving credit facility	1,091,966	1,257,755
Repayments under revolving credit facility	(1,091,966)	(1,247,942)
Payment of minimum tax withholdings on stock compensation	(68)	(762)
Common stock repurchased	(17,486)	0
Net cash flows (used in) provided by financing activities	(185,811)	76,413
Net change in cash and cash equivalents	(29,857)	16,668
Cash and cash equivalents at beginning of period	43,591	23,127
Cash and cash equivalents at end of period	$ 13,734	$ 39,795