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Benefit Plans (Details 2) (Non-qualified deferred compensation plan, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Non-qualified deferred compensation plan
   
Benefit Plans    
Maximum annual contribution an employee is permitted to defer $ 50  
Cash surrender value of the Company owned life insurance ("COLI") policies 5,620 3,902
Deferred compensation liability $ 6,064 $ 3,929