Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net income	$ 5,369us-gaap_ProfitLoss	$ 1,357us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,557us-gaap_Depreciation	9,126us-gaap_Depreciation
Bad debt expense	82us-gaap_ProvisionForDoubtfulAccounts	56us-gaap_ProvisionForDoubtfulAccounts
Sale leaseback deferred gain amortization	(56)	(37)
Stock compensation-net of excess tax benefits	119us-gaap_ShareBasedCompensation	86us-gaap_ShareBasedCompensation
Provision for deferred income taxes	2,988us-gaap_DeferredIncomeTaxExpenseBenefit	778us-gaap_DeferredIncomeTaxExpenseBenefit
Recognized loss on marketable equity securities	13us-gaap_GainLossOnSaleOfInvestments	(44)us-gaap_GainLossOnSaleOfInvestments
Gain on sale or disposal of equipment	(1,161)us-gaap_GainLossOnDispositionOfAssets	(1,266)us-gaap_GainLossOnDispositionOfAssets
Changes in operating assets and liabilities:
Accounts receivable	(2,422)	(5,899)
Prepaid expenses, inventories, and other assets	1,724	(1,794)
Income taxes refundable	377	111
Trade accounts payable	5,410	1,295
Accrued expenses and other liabilities	1,810	1,761
Net cash provided by operating activities	21,810	5,530
INVESTING ACTIVITIES:
Purchases of property and equipment	(14,581)	(6,935)
Proceeds from disposition of equipment	4,412	17,610
Change in restricted cash	(1,566)	209
Purchases of marketable equity securities, net of return of capital	(2,395)	12
Net cash (used in) provided by investing activities	(14,130)	10,896
FINANCING ACTIVITIES:
Borrowings under line of credit	133,644	135,196
Repayments under line of credit	(133,644)	(124,706)
Borrowings of long-term debt	10,473	5,709
Repayments of long-term debt	(16,338)us-gaap_RepaymentsOfLongTermDebt	(19,085)us-gaap_RepaymentsOfLongTermDebt
Borrowings under margin account	2,476us-gaap_ProceedsFromOtherDebt	21us-gaap_ProceedsFromOtherDebt
Repayments under margin account	(272)us-gaap_RepaymentsOfOtherDebt	(215)us-gaap_RepaymentsOfOtherDebt
Repurchases of common stock	(28,743)	(14,216)
Exercise of stock options	57	187
Net cash used in financing activities	(32,347)	(17,109)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(24,667)	(683)
CASH AND CASH EQUIVALENTS-Beginning of period	27,649	1,172
CASH AND CASH EQUIVALENTS-End of period	2,982	489
Cash paid during the period for:
Interest	619us-gaap_InterestPaid	871us-gaap_InterestPaid
Income taxes	40us-gaap_IncomeTaxesPaid	10us-gaap_IncomeTaxesPaid
NONCASH INVESTING AND FINANCING ACTIVITIES-
Purchases of property and equipment included in accounts payable	$ 941us-gaap_StockIssued1	$ 1,703us-gaap_StockIssued1

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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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