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Income Tax (Details 1) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current Income Tax Expense (Benefit) [Abstract]      
Current Federal Tax Expense (Benefit) $ 52,378,000 $ (1,605,000) $ (217,970,000)
Current Foreign Tax Expense (Benefit) 36,840,000 50,138,000 63,233,000
Current Income Tax Expense (Benefit) 89,218,000 48,533,000 (154,737,000)
Deferred Income Tax Expense (Benefit) [Abstract]      
Deferred Federal Income Tax Expense (Benefit) 183,929,000 155,895,000 392,905,000
Deferred Foreign Income Tax Expense (Benefit) 14,183,000 13,098,000 32,271,000
Deferred income taxes cash flow 198,112,000 168,994,000 425,174,000
Provision for income taxes $ 287,330,000 $ 217,526,000 $ 270,439,000