Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 17,808us-gaap_NetIncomeLoss	$ 5,244us-gaap_NetIncomeLoss	$ 6,065us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for losses on accounts receivable	774us-gaap_ProvisionForDoubtfulAccounts	457us-gaap_ProvisionForDoubtfulAccounts	904us-gaap_ProvisionForDoubtfulAccounts
(Realized gain) deferred gain on sales of equipment to affiliate, net	(33)	81	198
Depreciation and amortization	49,043us-gaap_DepreciationAndAmortization	44,457us-gaap_DepreciationAndAmortization	48,135us-gaap_DepreciationAndAmortization
Amortization of deferred financing fees	256us-gaap_AmortizationOfFinancingCosts	245us-gaap_AmortizationOfFinancingCosts	492us-gaap_AmortizationOfFinancingCosts
Unrealized loss (gain) on ineffective portion of fuel hedges	1,510	(55)
Cash collateral on fuel hedge	(5,000)
Deferred income tax expense	14,681us-gaap_DeferredIncomeTaxExpenseBenefit	8,217us-gaap_DeferredIncomeTaxExpenseBenefit	6,735us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax (benefit) deficit arising from restricted share vesting	(834)	111
Casualty premium credit			(4,000)us-gaap_ProvisionForOtherCreditLosses
Equity in income of affiliate	(3,730)	(2,750)	(1,875)
Gain on disposition of property and equipment	(2,659)us-gaap_GainLossOnDispositionOfAssets	(763)us-gaap_GainLossOnDispositionOfAssets	(4,913)us-gaap_GainLossOnDispositionOfAssets
Stock-based compensation expense	1,386	381	1,284
Receivables and advances	(16,996)us-gaap_IncreaseDecreaseInReceivables	(4,312)us-gaap_IncreaseDecreaseInReceivables	(10,415)us-gaap_IncreaseDecreaseInReceivables
Prepaid expenses and other assets	1,680	(2,014)	4,630
Inventory and supplies	316us-gaap_IncreaseDecreaseInInventories	(168)us-gaap_IncreaseDecreaseInInventories	61us-gaap_IncreaseDecreaseInInventories
Insurance and claims accrual	9,986	(2,399)	3,979
Accounts payable and accrued expenses	5,556	(6,287)	3,821
Net cash flows provided by operating activities	73,744	40,445	55,101
Cash flows from investing activities:
Acquisition of property and equipment	(163,679)	(135,896)	(41,787)
Investment in affiliated company		(500)	(2,900)
Return of investment in affiliated company	307	65	316
Proceeds from disposition of property and equipment	78,776	51,930	57,525
Net cash flows (used in) provided by investing activities	(84,596)	(84,401)	13,154
Cash flows from financing activities:
Change in checks outstanding in excess of bank balances	(2,918)	(5,343)	2,298
Debt refinancing costs	(49)us-gaap_PaymentsOfFinancingCosts	(356)us-gaap_PaymentsOfFinancingCosts	(26)us-gaap_PaymentsOfFinancingCosts
Payment of minimum tax withholdings on stock compensation	(832)	(340)	(9)
(Repayments) proceeds of/from borrowings under revolving credit facility, net	(7,010)	7,005	(15,885)
Repayments of capital lease obligation	(11,492)	(2,186)	(1,992)
Proceeds from issuance of notes payable	115,364us-gaap_ProceedsFromNotesPayable	134,192us-gaap_ProceedsFromNotesPayable	26,395us-gaap_ProceedsFromNotesPayable
Repayments of notes payable	(134,560)us-gaap_RepaymentsOfNotesPayable	(86,488)us-gaap_RepaymentsOfNotesPayable	(76,085)us-gaap_RepaymentsOfNotesPayable
Proceeds from exercise of stock options	598
Proceeds from issuance of stock in follow-on offering, net of offering costs	62,984
Income tax benefit (deficit) arising from restricted share vesting	834	(111)
Net cash flows provided by (used in) financing activities	22,919	46,373	(65,304)
Net change in cash and cash equivalents	12,067	2,417	2,951
Cash and cash equivalents at beginning of year	9,263	6,846	3,895
Cash and cash equivalents at end of year	21,330	9,263	6,846
Supplemental disclosure of cash flow information:
Interest, net of capitalized interest	10,919us-gaap_InterestPaidNet	10,328us-gaap_InterestPaidNet	12,967us-gaap_InterestPaidNet
Income taxes	571us-gaap_IncomeTaxesPaid	320us-gaap_IncomeTaxesPaid	342us-gaap_IncomeTaxesPaid
Equipment purchased under capital leases	4,552us-gaap_CapitalLeaseObligationsIncurred	8,010us-gaap_CapitalLeaseObligationsIncurred
Accrued investment in TEL			$ 500us-gaap_TransferToInvestments

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a borrowing supported by a written promise to pay an obligation.

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The net cash inflow or outflow from the excess drawing from an existing cash balance, which will be honored by the bank but reflected as a loan to the drawer.

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The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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Amount of expense related to credit loss from transactions other than loan and lease transactions.

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The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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Value of investments transferred to the entity's investments in noncash transactions.

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Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective.

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