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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 1,510 $ 7,984
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for losses on accounts receivable 177 (457)
Reversal of gain on sales to equity method investee (95) (123)
Depreciation and amortization 37,268 33,235
Amortization of deferred financing fees 136 156
Deferred income tax expense (benefit) 1,102 (6,796)
Income tax benefit arising from restricted share vesting 84 560
Stock-based compensation expense 604 804
Income from equity method investment (1,825) (2,000)
Return on investment in affiliated company 1,960 1,470
Loss/(gain) on disposition of property and equipment 2,507 (331)
Changes in operating assets and liabilities:    
Receivables and advances 6,264 49,320
Prepaid expenses and other assets (456) (3,586)
Inventory and supplies 19 (206)
Insurance and claims accrual 3,222 (4,080)
Accounts payable and accrued expenses (6,167) (11,569)
Net cash flows provided by operating activities 46,310 64,381
Cash flows from investing activities:    
Acquisition of property and equipment (50,177) (60,673)
Proceeds from disposition of property and equipment 26,060 49,432
Net cash flows used in investing activities (24,117) (11,241)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances 3,328 (4,698)
Proceeds from issuance of notes payable 54,749 40,403
Proceeds from the exercise of stock options 32
Repayments of notes payable (54,977) (91,229)
Repayments of capital lease obligations (6,044) (877)
Proceeds under revolving credit facility 585,729 524,397
Repayments under revolving credit facility (593,834) (516,536)
Payment of minimum tax withholdings on stock compensation (203) (581)
Debt refinancing costs (108)
Net cash used in financing activities (11,252) (49,197)
Net change in cash and cash equivalents 10,941 3,943
Cash and cash equivalents at beginning of period 7,750 4,490
Cash and cash equivalents at end of period $ 18,691 $ 8,433