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Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Qualifying Cash Flow Hedging Instruments	$ (306)	$ 2,295	$ 2,923	$ (58,723)
Accumulated Other Comprehensive Income (Loss), Pension Adjustments	(22,941)	(17,539)	(10,294)	(23,338)
Accumulated Other Comprehensive Income (Loss), Unrealized Gain on Available for Sale Marketable Securities	(656)	7,073	5,837
Accumulated Other Comprehensive Income (Loss), Total	(23,903)	(8,171)	(1,534)	(82,061)
Other comprehensive (loss) income, Qualifying cash flow hedging instruments	(2,601)	(628)	61,646
Other comprehensive (loss) income, Pension adjustments	(5,402)	(7,245)	13,044
Other Comprehensive (loss) income, Unrealized gain on available for sale marketable securities	(7,729)	1,236	5,837
Other comprehensive income (loss)	$ (16,678)	$ (6,528)	$ 89,522

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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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 or Decrease in deferred hedging gains or losses.

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Gross appreciation or the gross loss in value of the total unsold securities. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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