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Summary of Significant Accounting Policies (Details 8) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Net unrealized gain (loss) on derivative instruments qualifying as hedges: [Abstract] |  |  |
Net unrealized gain (loss) on derivative instruments arising during the period | $ 7,900,000 | $ (3,077,000) | $ (4,094,000)
Less: Reclassification adjustment for gain (loss) on derivative instruments included in net income | 0 | (3,750,000) | 47,590,000
Net unrealized gain (loss) on derivative instruments qualifying as hedges | 7,900,000 | 673,000 | (51,684,000)
Postretirement liability adjustment, net of tax | (22,427,000) | (5,730,000) | 9,918,000
Foreign currency translation adjustment, net of tax | (1,295,000) | (5,371,000) | 10,568,000
Net unrealized gains on available-for-sale investments, net of tax | 82,000 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | (15,740,000) | (10,428,000) | (31,198,000)
Other Comprehensive Income (Loss), Parenthetical [Abstract] |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 4,683,000 | (1,867,000) | (2,509,000)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax | 0 | (2,305,000) | 29,170,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax | (13,573,000) | (3,609,000) | 6,291,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax | 44,000 | 0 | 0
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax | (832,000) | (3,486,000) | 6,814,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Net unrealized gain (loss) on derivative instruments qualifying as hedges | 6,275,000 | (1,625,000) | (2,298,000)
Post-retirement liability adjustment | (53,320,000) | (30,893,000) | (25,163,000)
Foreign currency translation adjustment | (38,000) | 1,257,000 | 6,628,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | 82,000 | 0 | 0
Total accumulated other comprehensive income (loss) | $ (47,001,000) | $ (31,261,000) | $ (20,833,000)

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