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Fair Value Measurement (Details Textual)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
USD ($)
Sellers
Dec. 31, 2014
USD ($)
Fair Value Measurement (Textual)    
Interest rate swap, notional amount $ 115,600  
Carrying value of the debt $ 115,625  
Deferred payment arrangement number of sellers | Sellers 1  
Fair value assets and liabilities hierarchy level transfers amount    
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurement (Textual)    
Assets measured at fair value on a non-recurring basis, goodwill $ 6,800 $ 6,800
Assets measured at fair value on a non-recurring basis, other indefinite-lived intangible assets $ 1,600 $ 1,600