Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUES	$ 607,438	$ 730,133	$ 667,382
OPERATING EXPENSES
Salaries, wages and benefits	184,644	188,884	176,988
Fuel	53,928	150,003	133,776
Maintenance, materials and repairs	97,540	86,929	79,143
Depreciation and amortization	84,477	91,063	87,594
Travel	22,683	28,335	22,709
Rent	25,970	25,201	15,339
Landing and ramp	15,973	22,630	23,782
Insurance	7,716	9,309	9,171
Impairment of goodwill	0	2,797	0
Impairment of acquired intangibles	0	2,282	0
Impairment of aircraft	0	22,065	0
Other operating expenses	35,819	38,006	37,204
Operating Expenses	528,750	667,504	585,706
OPERATING INCOME	78,688	62,629	81,676
OTHER INCOME (EXPENSE)
Interest income	136	179	316
Interest expense	(14,383)	(14,181)	(18,675)
Net gain (loss) on derivative instruments	1,879	(4,881)	0
Write-off of unamortized debt issuance costs	0	(2,886)	0
Other Nonoperating Income (Expense)	(12,368)	(21,769)	(18,359)
EARNINGS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	66,320	40,860	63,317
INCOME TAX EXPENSE	(24,672)	(16,995)	(23,413)
EARNINGS FROM CONTINUING OPERATIONS	41,648	23,865	39,904
EARNINGS (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAXES	(774)	(673)	(70)
NET EARNINGS	$ 40,874	$ 23,192	$ 39,834
BASIC EARNINGS PER SHARE
Continuing operations (in dollars per share)	$ 0.66	$ 0.38	$ 0.64
Discontinued operations (in dollars per share)	$ (0.02)	$ (0.01)	$ (0.01)
TOTAL BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.64	$ 0.37	$ 0.63
DILUTED EARNINGS PER SHARE
Continuing operations (in dollars per share)	$ 0.65	$ 0.37	$ 0.62
Discontinued operations (in dollars per share)	$ (0.02)	$ (0.01)	$ 0.00
TOTAL DILUTED NET EARNINGS PER SHARE (in dollars per share)	$ 0.63	$ 0.36	$ 0.62
WEIGHTED AVERAGE SHARES
Basic (in shares)	63,461	63,284	62,807
Diluted (in shares)	64,420	64,085	64,009