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Summary of Significant Accounting Policies - Foreign Currency Translation (Details)
€ in Thousands, CZK in Thousands, $ in Thousands
9 Months Ended
Jan. 01, 2002
Sep. 30, 2016
USD ($)
Jun. 01, 2015
CZK
Jan. 01, 2003
EUR (€)
Jan. 01, 2003
USD ($)
Jun. 30, 1998
CZK
Impact of foreign currency translation on goodwill            
Residual balance   $ 5,143   € 119 $ 3,710 CZK 124,509
Net cumulative change to goodwill due to foreign currency translation   $ 1,433        
Period over which goodwill was amortized 15 years          
Pilsen reporting unit            
Impact of foreign currency translation on goodwill            
Applicable Foreign Exchange Rate ("FX")   24.210       33.883
Residual balance   $ 4,257     3,042 CZK 103,072
Net cumulative change to goodwill due to foreign currency translation   $ 1,215        
South-Moravia reporting unit            
Impact of foreign currency translation on goodwill            
Applicable Foreign Exchange Rate ("FX")   24.210       33.883
Residual balance   $ 752     537 CZK 18,195
Net cumulative change to goodwill due to foreign currency translation   $ 215        
Lower Saxony reporting unit            
Impact of foreign currency translation on goodwill            
Applicable Foreign Exchange Rate ("FX")   24.210 27.245      
Residual balance   $ 134 CZK 3,242 € 119 $ 131  
Net cumulative change to goodwill due to foreign currency translation   $ 3