Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Components of other comprehensive income (loss) and related tax effects
Amounts reclassified, Net of tax			$ 848	$ 4,310
Changes in fair value of swaps, net of taxes			819	(7,354)
Other comprehensive income (loss), Total, Gross	(3,083)	(4,291)	2,688	(4,934)
Income tax effect of other comprehensive income (loss)	1,172	1,630	(1,021)	1,890
Other comprehensive income (loss), Total, Net of tax	(1,911)	(2,661)	1,667	(3,044)
Total comprehensive income (Textuals) [Abstract]
Total comprehensive income	42,694	27,976
Interest Rate Swap [Member]
Components of other comprehensive income (loss) and related tax effects
Amounts reclassified, Gross	1,589	2,309	3,455	4,628
Amounts reclassified, Tax effect	(604)	(878)	(1,313)	(1,759)
Amounts reclassified, Net of tax	985	1,431	2,142	2,869
Changes in fair value, Gross	(2,670)	(4,968)	(2,603)	(8,791)
Changes in fair value, Tax effect	1,015	1,888	989	3,356
Changes in fair value of swaps, net of taxes	(1,655)	(3,080)	(1,614)	(5,435)
Fuel Hedges [Member]
Components of other comprehensive income (loss) and related tax effects
Amounts reclassified, Gross	(1,278)	414	(2,088)	2,324
Amounts reclassified, Tax effect	486	(157)	794	(883)
Amounts reclassified, Net of tax	(792)	257	(1,294)	1,441
Changes in fair value, Gross	(724)	(2,046)	3,924	(3,095)
Changes in fair value, Tax effect	275	777	(1,491)	1,176
Changes in fair value of swaps, net of taxes	$ (449)	$ (1,269)	$ 2,433	$ (1,919)

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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-SubTopic 10
-Section 45
-Paragraph 13
-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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