Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Disclosure Of Fair Value Of Assets And Liabilities (Narrative) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Fair Value Of Assets And Liabilities [Abstract]    
Fair value of Company's long-term debt $ 2,160,034,000 $ 2,133,214,000
Book value of Company's long-term debt $ 2,154,920,000 $ 2,088,654,000