Debt Obligations (11.5% Convertible Bonds) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013 11.5% Fixed Rate [Member] Convertible Debt [Member]	Sep. 30, 2013 7.5% Fixed Rate [Member]	Dec. 31, 2012 7.5% Fixed Rate [Member]	Sep. 30, 2013 7.5% Fixed Rate [Member] Convertible Debt [Member]
Debt Instrument [Line Items]
Interest rate	11.50%	7.50%	7.50%	7.50%
Debt maturity date	Mar. 31, 2014
Conversion price per share	$ 16.52
Principal amount of notes	$ 1,000
Conversion rate	61