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Long-Term Debt Convertible Debt (Details) (USD $)	6 Months Ended
Long-Term Debt Convertible Debt (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Feb. 17, 2007
Debt Instrument [Line Items]
Long-term Debt	$ 56,116,000	$ 45,286,000
Convertible Subordinated Debt [Member] \| Convertible Senior Subordinated Debentures February 2027 [Member]
Debt Instrument [Line Items]
Long-term Debt	10,986,000	10,641,000
Debt Instrument, Convertible, Principal amount of Liability Component	13,350,000	13,350,000
Debt Instrument, Unamortized Discount	(2,364,000)	(2,709,000)
Principal Amount			$ 135,000,000
Interest Rate	4.125%

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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