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Fair Value (Details) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Fair Value (Details) [Abstract]  
Fair value of senior notes$ 279,600,000$ 299,800,000
Carrying value of senior notes300,000,000300,000,000[1]
Amount of difference between fair value and carrying value$ 20,400,000$ 200,000
[1]Audited