Long-Term Debt Components of Convertible Debt (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	$ 3,341,000
Convertible Subordinated Debt [Member] | Convertible Senior Subordinated Debentures February 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component	25,381,000	25,216,000
Principal amount of liability component	13,350,000	13,850,000
Debt Instrument, Unamortized Discount	(3,341,000)	(4,053,000)
Convertible Debt	10,009,000	9,797,000
Line of Credit [Member] | Senior Secured Revolving Credit Facility October 2015 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Borrowing Denominated in Foreign Currencies	$ 0