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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 14,388 $ 1,510
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for losses on accounts receivable 113 177
Reversal of gain on sales to equity method investee (171) (95)
Depreciation and amortization 36,829 37,268
Amortization of deferred financing fees 73 136
Deferred income tax expense 6,495 1,102
Income tax benefit arising from restricted share vesting 4 84
Stock-based compensation expense 2,138 604
Equity in income of affiliate (3,265) (1,825)
Return on investment in affiliated company 1,960
Loss on disposition of property and equipment 684 2,507
Changes in operating assets and liabilities:    
Receivables and advances 11,821 6,264
Prepaid expenses and other assets (5,238) (456)
Inventory and supplies (81) 19
Insurance and claims accrual (2,793) 3,222
Accounts payable and accrued expenses 1,635 (6,167)
Net cash flows provided by operating activities 62,632 46,310
Cash flows from investing activities:    
Acquisition of property and equipment (31,771) (50,177)
Proceeds from disposition of property and equipment 38,127 26,060
Net cash flows provided by (used in) investing activities 6,356 (24,117)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances 3,328
Proceeds from issuance of notes payable 78,832 54,749
Repayments of notes payable (30,455) (54,977)
Repayments of capital lease obligations (1,534) (6,044)
Proceeds under revolving credit facility 755,886 585,729
Repayments under revolving credit facility (764,892) (593,834)
Payment of minimum tax withholdings on stock compensation (18) (203)
Debt refinancing costs (17)
Net cash provided by (used in) financing activities 37,802 (11,252)
Net change in cash and cash equivalents 106,790 10,941
Cash and cash equivalents at beginning of period 15,356 7,750
Cash and cash equivalents at end of period 122,146 18,691
Supplemental disclosure of cash flow information:    
Equipment purchased under capital leases $ 16,820 $ 5,786