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Disclosure Of Fair Value Of Financial Instruments (Details) (USD $)
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Mar. 31, 2014
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Dec. 31, 2013
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| Disclosure Of Fair Value Of Financial Instruments [Abstract] | ||
| Fair value of Company's long-term debt | $ 2,288,708,000 | $ 2,407,802,000 |
| Book value of Company's long-term debt | $ 2,232,287,000 | $ 2,362,766,000 |