Loss Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 7.50% Notes [Member]	Jul. 31, 2012 7.50% Notes [Member]	Jun. 30, 2013 7.50% Senior Exchange Convertible Notes Member [Member]	Jul. 31, 2012 7.50% Senior Exchange Convertible Notes Member [Member]	Jun. 30, 2013 4.50% Notes [Member]	Mar. 30, 2004 4.50% Notes [Member]
Debt Instrument [Line Items]
Interest rate on notes excluded from earnings per share calculation (percent)					7.50%	7.50%	7.50%	7.50%	4.50%	4.50%
Cancellation of common stock (in shares)	0	7,160	2,364	5,072
Issuance of common stock (in shares)	2,559,833		2,565,607
Numerator: [Abstract]
Basic and diluted loss per share - net loss	$ (4,668)	$ (11,345)	$ (9,427)	$ (19,796)
Denominator: [Abstract]
Basic and diluted weighted average shares outstanding (in shares)	12,993,514	12,523,843	12,824,927	12,522,663