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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income (loss) $ 4,417 $ (39)
Adjustments to reconcile net income to net cash provided by operating activities:    
(Reversal of) provision for losses on accounts receivable (8) 189
Reversal of gain on sales to equity method investee (160) (65)
Depreciation and amortization 18,614 18,666
Amortization of deferred financing fees 37 68
Deferred income tax expense 1,691 2,395
Income tax benefit arising from restricted share vesting 4 84
Stock-based compensation expense 826 155
Equity in income of affiliate (1,490) (1,025)
Loss on disposition of property and equipment 1,081 450
Changes in operating assets and liabilities:    
Receivables and advances 12,995 12,039
Prepaid expenses and other assets 2,327 2,214
Inventory and supplies (42) (54)
Insurance and claims accrual 650 4,671
Accounts payable and accrued expenses (4,246) (9,081)
Net cash flows provided by operating activities 36,696 30,667
Cash flows from investing activities:    
Acquisition of property and equipment (32,160) (22,511)
Proceeds from disposition of property and equipment 18,429 6,623
Net cash flows used in investing activities (13,731) (15,888)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances 1,422
Proceeds from issuance of notes payable 29,674 21,399
Repayments of notes payable (23,784) (34,286)
Repayments of capital lease obligations (799) (5,424)
Proceeds under revolving credit facility 336,616 261,123
Repayments under revolving credit facility (341,622) (259,308)
Payment of minimum tax withholdings on stock compensation (18) (203)
Debt refinancing costs (17)
Net cash provided by (used in) financing activities 50 (15,277)
Net change in cash and cash equivalents 23,015 (498)
Cash and cash equivalents at beginning of period 15,356 7,750
Cash and cash equivalents at end of period 38,371 7,252
Supplemental disclosure of cash flow information:    
Equipment purchased under capital leases $ 5,786