Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (2,213)	$ 4,433
Adjustments to reconcile net (loss) income to net cash (used) provided by operating activities:
Provision for (reversal of losses on) accounts receivable	320	(32)
Reversal of gain on sales to equity method investee	(2)	(1)
Depreciation and amortization	18,187	19,851
Amortization of deferred financing fees	37	37
Deferred income tax (benefit) expense	(904)	442
Income tax benefit arising from restricted share vesting and stock options exercised	9	668
Stock-based compensation expense	466	1,262
Equity in loss (income) of affiliate	735	(3,035)
Gain on disposition of property and equipment	(1,524)	(143)
Return on investment in available-for-sale securities		203
Changes in operating assets and liabilities:
Receivables and advances	(48,218)	(2,482)
Prepaid expenses and other assets	3,802	2,759
Inventory and supplies	398	(58)
Insurance and claims accrual	22,805	(4,537)
Accounts payable and accrued expenses	2,586	(10,197)
Net cash flows (used) provided by operating activities	(3,516)	9,170
Cash flows from investing activities:
Purchase of available-for-sale securities	245
Acquisition of property and equipment	(35,240)	(37,926)
Proceeds from disposition of property and equipment	18,497	4,431
Net cash flows used by investing activities	(16,498)	(33,495)
Cash flows from financing activities:
Change in checks outstanding in excess of bank balances	(111)	(223)
Proceeds from issuance of notes payable	29,746	19,217
Repayments of notes payable	(18,993)	(10,469)
Repayments of finance lease obligations	(1,305)	(1,373)
Proceeds under revolving credit facility	411,981	435,995
Repayments under revolving credit facility	(387,719)	(410,280)
Payment of minimum tax withholdings on stock compensation	(6)	(668)
Common stock repurchased	(17,515)
Net cash flows provided by financing activities	16,078	32,199
Net change in cash and cash equivalents	(3,936)	7,874
Cash and cash equivalents at beginning of period	43,591	23,127
Cash and cash equivalents at end of period	$ 39,655	$ 31,001