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Divestiture (Details)
€ in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2013
EUR (€)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Jul. 31, 2015
EUR (€)
Jul. 31, 2015
USD ($)
Jul. 31, 2014
EUR (€)
Jul. 31, 2014
USD ($)
Jul. 31, 2013
EUR (€)
Jul. 31, 2013
USD ($)
Jul. 31, 2012
EUR (€)
Jul. 31, 2012
USD ($)
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]                        
Date of divestiture Jul. 31, 2012                      
Cash received as part of the selling price                     € 815 $ 1,014
Amount financed as part of selling price                     5,351  
Total selling price                     € 6,166  
Total amount of installment payments received quarterly in 2013   € 2,126 $ 2,826                  
Total amount of first anniversary payment received                 € 1,075 $ 1,435    
Total amount of second anniversary payment received             € 1,075 $ 1,418        
Total amount of third and final anniversary payment received         € 1,075 $ 1,188            
Disposal Group, Not Discontinued Operation, Gain on Disposal | $       $ 784