Debt Obligations (7.5% Convertible Bonds) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Oct. 10, 2014	Jul. 31, 2008	Mar. 31, 2014
7.5% Fixed Rate [Member]
Debt Instrument [Line Items]
Interest rate	7.50%	7.50%	7.50%	7.50%
Conversion price	$ 16.52
Conversion rate	0.061
11.5% Convertible Bonds [Member]
Debt Instrument [Line Items]
Interest rate					11.50%