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Comprehensive Income (Loss) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Comprehensive income (net of tax):
Net income	$ 87,754	$ 30,000	$ 210,009	$ 118,065
Other comprehensive (loss) income
Net change in cash flow hedges	23,363	(30,374)	10,688	33,069
Unrealized (loss) gain on investments, available-for-sale	(2,925)	(2,354)	(4,896)	(1,499)
Pension and other post-retirement benefit plans	413	403	824	806
Total comprehensive income (loss)	108,605	(2,325)	216,625	150,441
Accumulated Other Comprehensive Income, Net of Tax
Net unrealized gain from hedging transactions	75,702		75,702		65,014
Unrealized gain on available-for-sale securities					4,896
Pension and other post-retirement benefits adjustment	(30,982)		(30,982)		(31,806)
Accumulated other comprehensive income	$ 44,720		$ 44,720		$ 38,104

X

- Definition

Accumulated appreciation or loss, net of tax, in value of the total of unsold securities at the end of an accounting period.

+ References

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Accumulated change, net of tax, 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 (decrease) in deferred hedging gains or losses.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Net changes to accumulated comprehensive income during the period related to benefit plans, after tax.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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