Debt Financing Contractual Maturities (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Debt Financing, Current Maturities	$ 92,173,000
Debt Financing, Maturities, Repayment of Principal in Year Two	10,198,900
Debt Financing, Maturities, Repayments of Principal in Year Three	1,139,000
Debt Financing, Maturities, Repayments of Principal in Year Four	1,192,000
Debt Financing, Maturities, Repayments of Principal in Year Five	89,565,000
Debt Financing, Maturities, Repayments of Principal after Year Five	0
Debt financing	$ 194,267,900	$ 177,948,000