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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 16,835 $ 42,085 $ 17,808
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision (reversal) for losses on accounts receivable (241) 1,100 774
(Realized gain) deferred gain on sales of equipment to affiliate, net (207) (26) (33)
Depreciation and amortization 71,647 62,010 49,043
Amortization of deferred financing fees 293 261 256
Unrealized (gain) loss on ineffective portion of fuel hedges (1,454) 1,510
Return of (issuance of) cash collateral on fuel hedge 5,000 (5,000)
Deferred income tax (benefit) expense (922) 20,701 14,681
Income tax benefit arising from restricted share vesting and stock options exercised 1,108 (834)
Casualty premium credit (3,600)
Equity in income of affiliate (3,000) (4,570) (3,730)
Return on investment in affiliated company 1,470
Loss (gain) on disposition of property and equipment 808 (626) (2,659)
Stock-based compensation expense 1,378 1,496 1,386
Changes in operating assets and liabilities:      
Receivables and advances 21,207 (28,120) (16,996)
Prepaid expenses and other assets (1,464) 2,688 1,680
Inventory and supplies 24 398 316
Insurance and claims accrual (1,390) (1,304) 9,986
Accounts payable and accrued expenses (5,116) (10,562) 5,556
Net cash flows provided by operating activities 102,430 85,477 73,744
Cash flows from investing activities:      
Acquisition of property and equipment (112,794) (181,963) (163,679)
Return of investment in affiliated company 307
Proceeds from disposition of property and equipment 65,507 34,287 78,776
Net cash flows used by investing activities (47,287) (147,676) (84,596)
Cash flows from financing activities:      
Change in checks outstanding in excess of bank balances (4,509) 4,698 (2,918)
Debt refinancing costs (108) (242) (49)
Payment of minimum tax withholdings on stock compensation (1,142) (2,280) (832)
Proceeds from borrowings under revolving credit facility 1,023,978 870,432 1,003,195
Repayments of borrowings under revolving credit facility (1,014,796) (867,430) (1,010,205)
Repayments of capital lease obligation (4,140) (1,718) (11,492)
Proceeds from issuance of notes payable 69,432 113,077 115,364
Repayments of notes payable (120,630) (67,276) (134,560)
Proceeds from exercise of stock options 32 1,092 598
Proceeds from issuance of stock in follow-on offering, net of offering costs 62,984
Common stock repurchased (4,994)
Income tax benefit arising from restricted share vesting and stock options exercised 834
Net cash flows (used in) provided by financing activities (51,883) 45,359 22,919
Net change in cash and cash equivalents 3,260 (16,840) 12,067
Cash and cash equivalents at beginning of year 4,490 21,330 9,263
Cash and cash equivalents at end of year 7,750 4,490 21,330
Supplemental disclosure of cash flow information:      
Interest, net of capitalized interest 8,453 8,371 10,919
Income taxes 6,412 8,112 571
Equipment purchased under capital leases $ 11,765 $ 1,318 $ 4,552