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Fair Value Measurement (Details 1) (Deferred Payments [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Deferred Payments [Member]
 
Schedule of changes in fair value of level 3 liability  
Balance at December 31, 2013 $ 2,115
Amounts earned (115)
Adjustments to fair value 116
Transfers in or out of Level 3   
Balance at March 31, 2014 $ 2,116