Debt Obligations (6.5% Convertible Senior Notes Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Feb. 28, 2014	Dec. 31, 2014
Securities Purchase Agreement [Member]
Debt Instrument [Line Items]
Credit facility initiation date	Feb. 28, 2014
Value of common stock, warrants and convertible notes issued		$ 30,000,000
Common stock, shares issued		2.9
Number of common stock shares warrants can be converted into		0.7
Warrants exercise price		$ 5.292
Warrants expiration date	Feb. 28, 2019
Convertible Senior Notes, 6.5% Fixed Rate, Due 2017 [Member]
Debt Instrument [Line Items]
Debt principal amount		$ 17,500,000
Interest rate	6.50%	6.50%		6.50%
Conversion rate			0.2145002
Conversion price			$ 4.662