Basis of Financial Statement Presentation and Summary of Significant Accounting Policies - Loss Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Numerator: [Abstract]
Basic and diluted loss per share - net loss	$ (5,008)	$ (1,926)
Denominator: [Abstract]
Diluted weighted average number of shares outstanding (in shares)	21,995,460	21,929,852
Basic income (loss) per share (in dollars per share)	$ (0.23)	$ (0.09)
4.50% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)		4.50%	8.50%
7.50% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	7.50%	7.50%	7.50%
7.5% Senior Exchange Convertible Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	7.50%	7.50%	7.50%