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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Liabilities:    
Long-term debt carrying value $ 19,853 $ 20,221
Level 3 [Member]
   
Liabilities:    
Long-term debt estimated fair value $ 17,682 $ 18,057