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Fair Value Measurements (Textuals) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Fair Value Measurements (details) [Abstract]      
Long-term Debt, Fair Value $ 2,255,500,000   $ 2,253,200,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount     13,800,000
Accrued dividends receivable     1,300,000
Held-to-maturity Securities, Fair Value Disclosure 0    
Components Of Impairment Nonoperating [Line Items]      
Other Asset Impairment Charges 17,300,000 0  
Faustina Investment Impairment [Member]
     
Components Of Impairment Nonoperating [Line Items]      
Other Asset Impairment Charges $ 15,100,000