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Long - Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Long-Term Debt
Total long-term debt	$ 12,071	$ 17,785
Amounts are presented in the Consolidated Balance Sheets:
Current portion of long-term debt	5,714	5,714
Long-term debt, less current portion	6,357	12,071
Series A Term Note [Member]
Schedule of Long-Term Debt
Total long-term debt	4,286	6,429
Series B Term Note [Member]
Schedule of Long-Term Debt
Total long-term debt	3,000	4,500
Series C Term Note [Member]
Schedule of Long-Term Debt
Total long-term debt	2,857	4,286
Series D Term Note [Member]
Schedule of Long-Term Debt
Total long-term debt	$ 1,928	$ 2,570

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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