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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 42,085 $ 17,808 $ 5,244
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for losses on accounts receivable 1,100 774 457
(Realized gain) deferred gain on sales of equipment to affiliate, net (26) (33) 81
Depreciation and amortization 62,010 49,043 44,457
Amortization of deferred financing fees 261 256 245
Unrealized (gain) loss on ineffective portion of fuel hedges (1,454) 1,510 $ (55)
Return of (issuance of) cash collateral on fuel hedge 5,000 (5,000)
Deferred income tax expense $ 20,701 14,681 $ 8,217
Income tax (benefit) deficit arising from restricted share vesting $ (834) $ 111
Casualty premium credit $ (3,600)
Equity in income of affiliate (4,570) $ (3,730) $ (2,750)
Gain on disposition of property and equipment (626) (2,659) (763)
Stock-based compensation expense 1,496 1,386 381
Changes in operating assets and liabilities:      
Receivables and advances (28,120) (16,996) (4,312)
Prepaid expenses and other assets 2,688 1,680 (2,014)
Inventory and supplies 398 316 (168)
Insurance and claims accrual (1,304) 9,986 (2,399)
Accounts payable and accrued expenses (10,562) 5,556 (6,287)
Net cash flows provided by operating activities 85,477 73,744 40,445
Cash flows from investing activities:      
Acquisition of property and equipment $ (181,963) $ (163,679) (135,896)
Investment in affiliated company (500)
Return of investment in affiliated company $ 307 65
Proceeds from disposition of property and equipment $ 34,287 78,776 51,930
Net cash flows used by investing activities (147,676) (84,596) (84,401)
Cash flows from financing activities:      
Change in checks outstanding in excess of bank balances 4,698 (2,918) (5,343)
Debt refinancing costs (242) (49) (356)
Payment of minimum tax withholdings on stock compensation (2,280) (832) (340)
Proceeds from of borrowings under revolving credit facility 870,432 1,003,195 886,293
Repayments of borrowings under revolving credit facility (867,430) (1,010,205) (879,288)
Repayments of capital lease obligation (1,718) (11,492) (2,186)
Proceeds from issuance of notes payable 113,077 115,364 134,192
Repayments of notes payable (67,276) (134,560) $ (86,488)
Proceeds from exercise of stock options $ 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 (deficit) arising from restricted share vesting $ 834 $ (111)
Net cash flows provided by financing activities $ 45,359 22,919 46,373
Net change in cash and cash equivalents (16,840) 12,067 2,417
Cash and cash equivalents at beginning of year 21,330 9,263 6,846
Cash and cash equivalents at end of year 4,490 21,330 9,263
Supplemental disclosure of cash flow information:      
Interest, net of capitalized interest 8,371 10,919 10,328
Income taxes 8,112 571 320
Equipment purchased under capital leases $ 1,318 $ 4,552 $ 8,010