Long-Term Debt Convertible Debt (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Jun. 30, 2012 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Dec. 31, 2011 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Feb. 17, 2007 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount					$ (3,634,000)	$ (3,634,000)	$ (4,053,000)
Principal Amount								135,000,000
Interest Rate						4.125%
Extinguishment of Debt, Amount					500,000
Gains (Losses) on Extinguishment of Debt	(312,000)	(11,855,000)	(312,000)	(16,736,000)	(312,000)
Write off of Deferred Debt Issuance Cost					$ 11,000