Debt (Schedule Of Maturities Of Long-Term Debt Obligations) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
2013	$ 24,493,022
2014	24,682,812
2015	23,889,777
2016	24,115,980
2017	24,362,621
Thereafter	424,545,896
Long-term obligations, including current installments	546,090,108	429,450,318
2011 Series A Bonds [Member]
Debt Instrument [Line Items]
2013	10,666,667
2014	10,666,667
2015	10,666,667
2016	10,666,667
2017	10,666,667
Thereafter	210,999,998
Long-term obligations, including current installments	264,333,333
CoBank Note [Member]
Debt Instrument [Line Items]
2013	2,076,355
2014	2,266,145
2015	2,473,110
2016	2,699,313
2017	2,945,954
Thereafter	19,295,898
Long-term obligations, including current installments	31,756,775
2012 Series A Bonds [Member]
Debt Instrument [Line Items]
2013	11,750,000
2014	11,750,000
2015	10,750,000
2016	10,750,000
2017	10,750,000
Thereafter	194,250,000
Long-term obligations, including current installments	$ 250,000,000