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Debt (Schedule Of Carrying Values And Estimated Fair Values Of Long-Term Debt Obligations) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term obligations, including current installments	$ 546,090,108	$ 429,450,318
Carrying Value [Member]
Debt Instrument [Line Items]
Long-term obligations, including current installments	546,090	429,450
Fair Value [Member]
Debt Instrument [Line Items]
Long-term obligations, including current installments	$ 573,912	$ 442,711

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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