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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Balance at December 31, 2011 $ 6,751 $ 5,082
Total gains (losses) realized (unrealized):    
Included in earnings      
Included in other comprehensive income (45) (175)
Purchases    1,844
Sales      
Issuance and settlements      
Net transfers in (out of) Level 3      
Balance at December 31, 2012 6,706 6,751
Change in net unrealized gains relating to assets still held at reporting date $ (45) $ (175)