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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net (loss) income $ (39) $ 4,352
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for losses on accounts receivable 189 (123)
Realized gain on sales to affiliate, net (65) (43)
Depreciation and amortization 18,666 16,634
Loss on disposition of property and equipment 450 251
Amortization of deferred financing fees 68 77
Deferred income tax expense (benefit) 2,395 (7,836)
Income tax benefit arising from restricted share vesting and stock options exercised 84 555
Stock-based compensation expense 155 304
Income from equity method investment (1,025) (850)
Changes in operating assets and liabilities:    
Receivables and advances 12,039 47,697
Prepaid expenses and other assets 2,214 2,027
Inventory and supplies (54) (185)
Insurance and claims accrual 4,671 (538)
Accounts payable and accrued expenses (9,081) (10,809)
Net cash flows provided by operating activities 30,667 51,513
Cash flows from investing activities:    
Acquisition of property and equipment (22,511) (17,394)
Proceeds from disposition of property and equipment 6,623 28,593
Net cash flows (used in) provided by investing activities (15,888) 11,199
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances 1,422 (922)
Proceeds from issuance of notes payable 21,399 5,971
Proceeds from the exercise of stock options 32
Repayments of notes payable (34,286) (74,235)
Repayments of capital lease obligations (5,424) (437)
Proceeds under revolving credit facility 261,123 287,444
Repayments under revolving credit facility (259,308) (280,733)
Payment of minimum tax withholdings on stock compensation (203) (575)
Debt refinancing costs (57)
Net cash used in financing activities (15,277) (63,512)
Net change in cash and cash equivalents (498) (800)
Cash and cash equivalents at beginning of period 7,750 4,490
Cash and cash equivalents at end of period $ 7,252 $ 3,690