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 earnings (loss)	$ 10,363us-gaap_NetIncomeLoss	$ (5,321)us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	18,151us-gaap_DepreciationAndAmortization	11,363us-gaap_DepreciationAndAmortization
Deferred income taxes	6,279us-gaap_DeferredIncomeTaxExpenseBenefit	(4,559)us-gaap_DeferredIncomeTaxExpenseBenefit
(Gain) loss on asset dispositions	(7)us-gaap_GainLossOnDispositionOfAssets	1,073us-gaap_GainLossOnDispositionOfAssets
Equity in loss of unconsolidated affiliate	68	41
Loss on debt extinguishment		29,216
Inventory valuation reserves	562
Changes in operating assets and liabilities	(5,498)	(25,691)
Net cash provided by operating activities	29,918	6,122
Investing activities:
Purchase of property and equipment	(22,115)	(38,746)
Proceeds from asset dispositions		2,994
Purchase of short-term investments	(190,243)	(140,551)
Proceeds from sale of short-term investments	185,426	84,692
Refund on deposits on aircraft		3,926
Payments of deposits on aircraft	(66)	(6,499)
Net cash used in investing activities	(26,998)	(94,184)
Financing activities:
Proceeds from issuance of Senior Notes due 2019		500,000
Repayment of Senior Notes due 2018		(292,571)us-gaap_EarlyRepaymentOfSeniorDebt
Premium and costs to retire debt early		(26,132)
Debt issuance costs		(5,657)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from line of credit	77,740	95,500
Payments on line of credit	(81,100)	(174,500)
Repurchase of common stock	(2,207)	(176)
Net cash (used in) provided by financing activities	(5,567)	96,464
(Decrease) increase in cash	(2,647)	8,402
Cash, beginning of period	6,270us-gaap_Cash	934us-gaap_Cash
Cash, end of period	3,623us-gaap_Cash	9,336us-gaap_Cash
Cash paid during the period for:
Interest	13,453us-gaap_InterestPaid	11,280us-gaap_InterestPaid
Income taxes	3,061us-gaap_IncomeTaxesPaid	13us-gaap_IncomeTaxesPaid
Noncash investing activities:
Other current liabilities and accrued payables related to purchase of property and equipment	$ 28,994	$ 24,717

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

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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