Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES	$ 589,592us-gaap_Revenues	$ 580,023us-gaap_Revenues	$ 607,438us-gaap_Revenues
OPERATING EXPENSES
Salaries, wages and benefits	166,526us-gaap_LaborAndRelatedExpense	175,383us-gaap_LaborAndRelatedExpense	184,644us-gaap_LaborAndRelatedExpense
Fuel	53,521us-gaap_FuelCosts	49,376us-gaap_FuelCosts	53,928us-gaap_FuelCosts
Maintenance, materials and repairs	91,528	97,053	97,540
Depreciation and amortization	108,254us-gaap_DepreciationAndAmortization	91,749us-gaap_DepreciationAndAmortization	84,477us-gaap_DepreciationAndAmortization
Travel	17,662us-gaap_TravelAndEntertainmentExpense	18,693us-gaap_TravelAndEntertainmentExpense	22,683us-gaap_TravelAndEntertainmentExpense
Rent	26,650us-gaap_LeaseAndRentalExpense	27,468us-gaap_LeaseAndRentalExpense	25,970us-gaap_LeaseAndRentalExpense
Landing and ramp	10,305us-gaap_LandingFeesAndOtherRentals	11,204us-gaap_LandingFeesAndOtherRentals	15,973us-gaap_LandingFeesAndOtherRentals
Insurance	5,304us-gaap_GeneralInsuranceExpense	6,216us-gaap_GeneralInsuranceExpense	7,716us-gaap_GeneralInsuranceExpense
Impairment of goodwill	0us-gaap_GoodwillImpairmentLoss	52,585us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Pension settlement cost	6,700	0	0
Other operating expenses	38,617us-gaap_OtherCostAndExpenseOperating	37,111us-gaap_OtherCostAndExpenseOperating	35,819us-gaap_OtherCostAndExpenseOperating
Operating Expenses	525,067us-gaap_OperatingExpenses	566,838us-gaap_OperatingExpenses	528,750us-gaap_OperatingExpenses
OPERATING INCOME	64,525us-gaap_OperatingIncomeLoss	13,185us-gaap_OperatingIncomeLoss	78,688us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE)
Interest income	92us-gaap_InvestmentIncomeInterest	74us-gaap_InvestmentIncomeInterest	136us-gaap_InvestmentIncomeInterest
Interest expense	(13,937)us-gaap_InterestExpense	(14,249)us-gaap_InterestExpense	(14,383)us-gaap_InterestExpense
Net gain on derivative instruments	1,096	631	1,879
Other Nonoperating Income (Expense)	(12,749)us-gaap_OtherNonoperatingIncomeExpense	(13,544)us-gaap_OtherNonoperatingIncomeExpense	(12,368)us-gaap_OtherNonoperatingIncomeExpense
EARNINGS (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	51,776	(359)	66,320
INCOME TAX EXPENSE	(19,702)us-gaap_IncomeTaxExpenseBenefit	(19,266)us-gaap_IncomeTaxExpenseBenefit	(24,672)us-gaap_IncomeTaxExpenseBenefit
EARNINGS (LOSS) FROM CONTINUING OPERATIONS	32,074	(19,625)	41,648
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAXES	(2,214)	(3)	(774)
NET EARNINGS (LOSS)	$ 29,860us-gaap_NetIncomeLoss	$ (19,628)us-gaap_NetIncomeLoss	$ 40,874us-gaap_NetIncomeLoss
BASIC EARNINGS (LOSS) PER SHARE
Continuing operations (in dollars per share)	$ 0.50	$ (0.31)	$ 0.66
Discontinued operations (in dollars per share)	$ (0.04)	$ 0.00	$ (0.02)
TOTAL BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.46us-gaap_EarningsPerShareBasic	$ (0.31)us-gaap_EarningsPerShareBasic	$ 0.64us-gaap_EarningsPerShareBasic
DILUTED EARNINGS (LOSS) PER SHARE
Continuing operations (in dollars per share)	$ 0.49	$ (0.31)	$ 0.65
Discontinued operations (in dollars per share)	$ (0.03)	$ 0.00	$ (0.02)
TOTAL DILUTED NET EARNINGS PER SHARE (in dollars per share)	$ 0.46us-gaap_EarningsPerShareDiluted	$ (0.31)us-gaap_EarningsPerShareDiluted	$ 0.63us-gaap_EarningsPerShareDiluted
WEIGHTED AVERAGE SHARES
Basic (in shares)	64,253	63,992	63,461
Diluted (in shares)	65,211	63,992	64,420

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- Definition

Direct costs incurred at airports in which the entity conducts flight operations. The costs primarily consist of fees paid to the airport authority for takeoff and landing, gate space and facilities, allocations of common space such as security and other terminal costs and fuel storage facilities.

+ References

No definition available.

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.19)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-03.18)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

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-Subparagraph (SX 210.7-04.22)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 5

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 20

-Article 9

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- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

+ References

No definition available.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Article 5

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- Definition

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

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-Publisher FASB

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-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

Expenses incurred for travel and entertainment during the period.

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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