Loss Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 7.50% Notes [Member]	Mar. 31, 2012 7.50% Notes [Member]	Mar. 31, 2013 4.50% Notes [Member]	Mar. 31, 2012 4.50% Notes [Member]	Feb. 04, 2011 4.50% Notes [Member]
Debt Instrument [Line Items]
Interest rate on notes excluded from earnings per share calculation (in hundredths)			7.50%	7.50%	4.50%	4.50%	4.50%
Cancellation of common stock (in shares)	2,364	5,072
Issuance of common stock (in shares)	6.734
Numerator: [Abstract]
Basic and diluted loss per share - net loss	$ (4,759)	$ (8,451)
Denominator: [Abstract]
Basic and diluted weighted average shares outstanding (in shares)	12,654,466	12,521,483