Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Components of other comprehensive income (loss) and related tax effects
Amounts reclassified, Net of tax			$ 900	$ 6,308
Changes in fair value of swaps, net of taxes			(1,117)	(8,530)
Other comprehensive income (loss), Total, Gross	(3,038)	1,324	(350)	(3,610)
Income tax effect of other comprehensive loss	1,154	(503)	133	1,388
Other comprehensive income (loss), Total, Net of tax	(1,884)	821	(217)	(2,222)
Total comprehensive income (Textual) [Abstract]
Total comprehensive income	44,700	42,078
Interest Rate Swap [Member]
Components of other comprehensive income (loss) and related tax effects
Amounts reclassified, Gross	1,186	2,069	4,641	6,697
Amounts reclassified, Tax effect	(451)	(786)	(1,764)	(2,545)
Amounts reclassified, Net of tax	735	1,283	2,877	4,152
Changes in fair value, Gross	(2,081)	(3,777)	(4,684)	(12,568)
Changes in fair value, Tax effect	791	1,435	1,780	4,792
Changes in fair value of swaps, net of taxes	(1,290)	(2,342)	(2,904)	(7,776)
Fuel Hedges [Member]
Components of other comprehensive income (loss) and related tax effects
Amounts reclassified, Gross	(1,101)	1,154	(3,189)	3,478
Amounts reclassified, Tax effect	418	(438)	1,212	(1,322)
Amounts reclassified, Net of tax	(683)	716	(1,977)	2,156
Changes in fair value, Gross	(1,042)	1,878	2,882	(1,217)
Changes in fair value, Tax effect	396	(714)	(1,095)	463
Changes in fair value of swaps, net of taxes	$ (646)	$ 1,164	$ 1,787	$ (754)

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

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- Definition

Comprehensive income notes.

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- Definition

Total comprehensive income.

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