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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 4,433 $ 4,417
Adjustments to reconcile net income to net cash provided by operating activities:    
Reversal of losses on accounts receivable (32) (8)
Reversal of gain on sales to equity method investee (1) (160)
Depreciation and amortization 19,851 18,614
Amortization of deferred financing fees 37 37
Deferred income tax expense 442 1,691
Income tax benefit arising from restricted share vesting and stock options exercised 668 4
Stock-based compensation expense 1,262 826
Income from equity method investment (3,035) (1,490)
(Gain) Loss on disposition of property and equipment (143) 1,081
Return on investment in available-for-sale securities 203
Changes in operating assets and liabilities:    
Receivables and advances (2,482) 12,995
Prepaid expenses and other assets 2,759 2,327
Inventory and supplies (58) (42)
Insurance and claims accrual (4,537) 650
Accounts payable and accrued expenses (10,197) (4,246)
Net cash flows provided by operating activities 9,170 36,696
Cash flows from investing activities:    
Acquisition of property and equipment (37,926) (32,160)
Proceeds from disposition of property and equipment 4,431 18,429
Net cash flows used by investing activities (33,495) (13,731)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances (223)
Proceeds from issuance of notes payable 19,217 29,674
Repayments of notes payable (10,469) (23,784)
Repayments of finance lease obligations (1,373) (799)
Proceeds under revolving credit facility 435,995 336,616
Repayments under revolving credit facility (410,280) (341,622)
Payment of minimum tax withholdings on stock compensation (668) (18)
Debt refinancing costs (17)
Net cash flows provided by financing activities 32,199 50
Net change in cash and cash equivalents 7,874 23,015
Cash and cash equivalents at beginning of period 23,127 15,356
Cash and cash equivalents at end of period $ 31,001 $ 38,371