Fair Value Measurements - Carrying amounts and estimated fair values of the Company's long-term debt, including current maturities (Details 1) (Significant Other Observable Inputs (Level 2), USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	$ 3,518	$ 3,481
Long-term debt - convertible debentures		1,450
Liabilities, fair value disclosure	3,518	4,931
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	3,455	3,391
Long-term debt - convertible debentures		1,436
Liabilities, fair value disclosure	$ 3,455	$ 4,827