Debt Obligations (11.5% Convertible Bonds) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013 item
11.5% Fixed Rate [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Interest rate	11.50%
Debt maturity date	Mar. 31, 2014
Conversion price per share	$ 16.52
Principal amount of notes	$ 1,000
Conversion rate	61
7.5% Fixed Rate [Member]
Debt Instrument [Line Items]
Interest rate	7.50%
7.5% Fixed Rate [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Interest rate	7.50%