Long-Term Debt Components of Convertible Debt (Details) (Convertible Subordinated Debt [Member], Convertible Senior Subordinated Debentures February 2027 [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Convertible Subordinated Debt [Member] | Convertible Senior Subordinated Debentures February 2027 [Member]
Debt Instrument [Line Items]
Principal amount of liability component	$ 13,350	$ 13,850
Debt Instrument, Unamortized Discount	(3,634)	(4,053)
Convertible Debt	$ 9,716	$ 9,797