Quarterly report pursuant to Section 13 or 15(d)

Disclosure Of Fair Value Of Assets And Liabilities (Narrative) (Details)

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Disclosure Of Fair Value Of Assets And Liabilities (Narrative) (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Disclosure Of Fair Value Of Assets And Liabilities [Abstract]    
Fair value of Company's long-term debt $ 2,067,463,000 $ 2,133,214,000
Book value of Company's long-term debt $ 2,043,592,000 $ 2,088,654,000