Debt Obligations (6.5% Convertible Senior Notes Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	0 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended			3 Months Ended
	Feb. 28, 2014 Securities Purchase Agreement [Member]	Mar. 01, 2014 Securities Purchase Agreement [Member]	Feb. 28, 2014 Securities Purchase Agreement [Member]	Mar. 31, 2014 Securities Purchase Agreement [Member]	Jul. 31, 2011 Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]	Mar. 31, 2014 Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]	Dec. 31, 2013 Convertible Senior Notes, 5.5% Fixed Rate, Due 2016 [Member]	Mar. 31, 2014 11.5% Convertible Bonds [Member]
Debt Instrument [Line Items]
Credit facility initiation date				Feb. 28, 2014
Value of common stock, warrants and convertible notes issued	$ 55,000,000	$ 30,000,000
Common stock, shares issued	2.9	2.9	2.9
Number of common stock shares warrants can be converted into	0.7	0.7	0.7
Warrants exercise price	$ 5.292	$ 5.292	$ 5.292
Debt principal amount		17,500,000			135,000,000
Interest rate		6.50%				5.50%	5.50%	11.50%
Option purchase period			90 days	90 days
Value of options to purchase additional shares		$ 25,000,000	$ 25,000,000
Conversion rate		4.662			54.019			61
Conversion price		$ 4.662			$ 18.51			$ 16.52