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 earnings	$ 32,688us-gaap_NetIncomeLoss	$ 58,956us-gaap_NetIncomeLoss	$ 18,057us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	50,848us-gaap_DepreciationAndAmortization	42,848us-gaap_DepreciationAndAmortization	41,495us-gaap_DepreciationAndAmortization
Deferred income taxes	16,071us-gaap_DeferredIncomeTaxExpenseBenefit	21,921us-gaap_DeferredIncomeTaxExpenseBenefit	15,620us-gaap_DeferredIncomeTaxExpenseBenefit
Loss (gain) on asset dispositions	848us-gaap_GainLossOnDispositionOfAssets	(16,604)us-gaap_GainLossOnDispositionOfAssets	317us-gaap_GainLossOnDispositionOfAssets
Equity in loss of unconsolidated affiliate	96	262	863
Loss on debt extinguishment	29,833
Impairment of assets	10,508us-gaap_AssetImpairmentCharges	1,648us-gaap_AssetImpairmentCharges
Other	(96)us-gaap_OtherNoncashIncomeExpense	427us-gaap_OtherNoncashIncomeExpense	(115)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Accounts receivable	(6,758)	(32,123)	(41,567)
Inventories of spare parts	(2,656)	(5,062)	(8,831)
Income taxes receivable	644	(1,015)	(1,267)
Other assets	(1,212)	3,104	(81,199)
Accounts payable and accrued liabilities	(10,946)	27,191	99,876
Other long-term liabilities	(348)	3,543	7,301
Net cash provided by operating activities	119,519	105,096	50,550
Investing activities:
Purchase of property and equipment	(157,690)	(102,726)	(128,475)
Proceeds from asset dispositions	10,266	42,197	11,302
Purchase of short-term investments	(465,094)	(375,503)	(216,265)
Proceeds from sale of short-term investments	363,110	338,970	249,041
Payments of deposits on aircraft	(6,948)	(9,318)	(8,717)
Refund of deposits on aircraft	11,506	8,161	2,500
Loan to unconsolidated affiliate	(200)us-gaap_PaymentsForAdvanceToAffiliate		(975)us-gaap_PaymentsForAdvanceToAffiliate
Other investments	(200)		(50)
Net cash used in investing activities	(245,050)	(98,219)	(91,639)
Financing activities:
Proceeds from issuance of Senior Notes due 2019	500,000
Repayment of Senior Notes due 2018	(300,000)us-gaap_EarlyRepaymentOfSeniorDebt
Premium and costs to retire debt early	(26,749)
Debt issuance costs	(6,232)us-gaap_PaymentsOfDebtIssuanceCosts
Repurchase of common stock	(152)	(1,037)	(1,861)
Proceeds from line of credit	264,253	164,771	127,323
Payments on line of credit	(300,253)	(172,526)	(86,615)
Net cash provided by (used in) financing activities	130,867	(8,792)	38,847
Increase (decrease) in cash	5,336	(1,915)	(2,242)
Cash, beginning of year	934us-gaap_Cash	2,849us-gaap_Cash	5,091us-gaap_Cash
Cash, end of year	6,270us-gaap_Cash	934us-gaap_Cash	2,849us-gaap_Cash
Cash paid during the period for:
Interest	25,415us-gaap_InterestPaid	28,675us-gaap_InterestPaid	28,775us-gaap_InterestPaid
Income Taxes	9,590us-gaap_IncomeTaxesPaid	1,161us-gaap_IncomeTaxesPaid	237us-gaap_IncomeTaxesPaid
Accrued payables related to purchases of property and equipment	$ 192	$ 176	$ 101

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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The cash outflow to reacquire common stock during the period.

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-Publisher FASB

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The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

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No definition available.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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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 outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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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 maturities due beyond one year or the operating cycle, if longer.

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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 from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash outflow for the settlement of obligation drawn 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 maturities due beyond one year or the operating cycle, if longer.

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