Debt (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest Expense, exclusive of capitalized interest, consists of:
Loan Interest and commitment fees	$ 60,100,569	$ 42,597,361	$ 45,683,219
Amortization of Deferred Financing Costs	6,542,727	4,172,604	3,202,455
Total Interest Expense	$ 66,643,296	$ 46,769,965	$ 48,885,674