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Disclosure Of Fair Value Of Financial Instruments (Details) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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| Disclosure Of Fair Value Of Financial Instruments [Abstract] | ||
| Fair value of Company's long-term debt | $ 2,125,451,000 | $ 2,133,214,000 |
| Book value of Company's long-term debt | $ 2,107,572,000 | $ 2,088,654,000 |