Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES:
Net income	$ 13,491us-gaap_ProfitLoss	$ 5,915us-gaap_ProfitLoss	$ 2,179us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	36,296us-gaap_Depreciation	39,088us-gaap_Depreciation	38,298us-gaap_Depreciation
Bad debt expense	456us-gaap_ProvisionForDoubtfulAccounts	424us-gaap_ProvisionForDoubtfulAccounts	191us-gaap_ProvisionForDoubtfulAccounts
Stock compensation—net of excess tax benefits	270us-gaap_ShareBasedCompensation	317us-gaap_ShareBasedCompensation	346us-gaap_ShareBasedCompensation
Sale leaseback deferred gain amortization	(205)
Provision for deferred income taxes	7,512us-gaap_DeferredIncomeTaxExpenseBenefit	3,597us-gaap_DeferredIncomeTaxExpenseBenefit	1,365us-gaap_DeferredIncomeTaxExpenseBenefit
Reclassification of other than temporary impairment in marketable equity securities	1us-gaap_UnrealizedGainLossOnSecurities	29us-gaap_UnrealizedGainLossOnSecurities	70us-gaap_UnrealizedGainLossOnSecurities
Recognized gain on marketable equity securities	(1,040)us-gaap_GainLossOnSaleOfInvestments	(601)us-gaap_GainLossOnSaleOfInvestments	(2,362)us-gaap_GainLossOnSaleOfInvestments
Gain on sale or disposal of equipment	(4,591)us-gaap_GainLossOnDispositionOfAssets	(854)us-gaap_GainLossOnDispositionOfAssets	(166)us-gaap_GainLossOnDispositionOfAssets
Changes in operating assets and liabilities:
Accounts receivable	5,109	(8,873)	(3,313)
Prepaid expenses, deposits, inventories, and other assets	(3,299)	4,918	(426)
Income taxes refundable	(277)	124	(115)
Trade accounts payable	(1,555)	(2,802)	(3,369)
Accrued expenses and other liabilities	3,085	1,888	927
Net cash provided by operating activities	55,253	43,170	33,625
INVESTING ACTIVITIES:
Purchases of property and equipment	(28,588)	(71,520)	(98,046)
Proceeds from disposition of equipment	38,902	27,304	21,190
Changes in restricted cash	(7,873)	(120)	(215)
Sales of marketable equity securities	1,720	857	4,554
Purchases of marketable equity securities, net of return of capital	(4,210)	(838)	(77)
Net cash used in investing activities	(49)	(44,317)	(72,594)
FINANCING ACTIVITIES:
Borrowings under line of credit	469,918	422,324	445,224
Repayments under line of credit	(469,918)	(427,741)	(449,135)
Borrowings of long-term debt	42,979	41,593	72,991
Repayments of long-term debt	(58,247)us-gaap_RepaymentsOfLongTermDebt	(33,208)us-gaap_RepaymentsOfLongTermDebt	(23,152)us-gaap_RepaymentsOfLongTermDebt
Borrowings under margin account	4,351us-gaap_ProceedsFromOtherDebt	999us-gaap_ProceedsFromOtherDebt	15,948us-gaap_ProceedsFromOtherDebt
Repayments under margin account	(2,645)us-gaap_RepaymentsOfOtherDebt	(1,693)us-gaap_RepaymentsOfOtherDebt	(5,237)us-gaap_RepaymentsOfOtherDebt
Repurchases of common stock	(16,011)	(508)
Stock compensation excess tax benefits			6
Dividends paid			(17,403)us-gaap_PaymentsOfDividendsCommonStock
Exercise of stock options	846	46	54
Net cash (used in) provided by financing activities	(28,727)	1,812	39,296
NET INCREASE IN CASH AND CASH EQUIVALENTS	26,477	665	327
CASH AND CASH EQUIVALENTS—Beginning of year	1,172	507	180
CASH AND CASH EQUIVALENTS—End of year	27,649	1,172	507
Cash paid during the period for:
Interest	2,946us-gaap_InterestPaid	3,417us-gaap_InterestPaid	2,558us-gaap_InterestPaid
Income taxes	1,486us-gaap_IncomeTaxesPaid	77us-gaap_IncomeTaxesPaid	174us-gaap_IncomeTaxesPaid
NONCASH INVESTING AND FINANCING ACTIVITIES—
Purchases of revenue equipment included in accounts payable	1,079	598	2,794
Purchases of common stock included in accrued expenses and other liabilities	$ 28,743us-gaap_StockIssued1	$ 13,944us-gaap_StockIssued1

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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The cash inflow from sale of machinery and equipment.

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The cash inflow 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 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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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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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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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cash outflow for the payment of other borrowing not otherwise defined in the taxonomy.

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The portion of the deferred gain that was recognized in the current period.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The fair value of stock issued in noncash financing activities.

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Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

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