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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 6,141 $ 10,853
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for losses on accounts receivable 241 (531)
Reversal of gain on sales to equity method investee (153) (169)
Depreciation and amortization 54,489 52,142
Amortization of deferred financing fees 206 224
Deferred income tax expense (benefit) 16,437 (5,505)
Income tax benefit arising from restricted share vesting 96 560
Stock-based compensation expense 896 1,114
Income from equity method investment (2,575) (2,450)
Return on investment in affiliated company 1,960 1,470
Loss on disposition of property and equipment 3,217 90
Changes in operating assets and liabilities:    
Receivables and advances (19,975) 43,743
Prepaid expenses and other assets 1,439 (1,028)
Inventory and supplies (69) (108)
Insurance and claims accrual 837 (4,276)
Accounts payable and accrued expenses (400) (14,040)
Net cash flows provided by operating activities 62,787 82,089
Cash flows from investing activities:    
Acquisition of property and equipment (89,917) (100,920)
Proceeds from disposition of property and equipment 32,739 54,959
Net cash flows used in investing activities (57,178) (45,961)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances 1,325 (3,399)
Proceeds from issuance of notes payable 110,762 62,969
Proceeds from the exercise of stock options 32
Repayments of notes payable (101,717) (103,627)
Repayments of capital lease obligations (6,689) (3,711)
Proceeds under revolving credit facility 930,161 762,338
Repayments under revolving credit facility (938,667) (749,504)
Payment of minimum tax withholdings on stock compensation (257) (581)
Debt refinancing costs (108)
Net cash used in financing activities (5,082) (35,591)
Net change in cash and cash equivalents 527 537
Cash and cash equivalents at beginning of period 7,750 4,490
Cash and cash equivalents at end of period 8,277 5,027
Supplemental disclosure of cash flow information:    
Equipment purchased under capital leases $ 9,953 $ 4,562