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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, 2017
USD ($)
Jun. 01, 2015
CZK
Jan. 01, 2003
USD ($)
Jan. 01, 2003
EUR (€)
Sep. 30, 1998
Jun. 30, 1998
CZK
Impact of foreign currency translation on goodwill              
Residual balance   $ 5,659   $ 3,710 € 119   CZK 124,509
Net cumulative change to goodwill due to foreign currency translation   $ 1,949          
Period over which goodwill was amortized 15 years            
Pilsen reporting unit              
Impact of foreign currency translation on goodwill              
Applicable Foreign Exchange Rate ("FX")   22.003       33.883  
Residual balance   $ 4,685   3,042     103,072
Net cumulative change to goodwill due to foreign currency translation   $ 1,643          
South-Moravia reporting unit              
Impact of foreign currency translation on goodwill              
Applicable Foreign Exchange Rate ("FX")   22.003       33.883  
Residual balance   $ 827   537     CZK 18,195
Net cumulative change to goodwill due to foreign currency translation   $ 290          
Lower Saxony reporting unit              
Impact of foreign currency translation on goodwill              
Applicable Foreign Exchange Rate ("FX")   22.003 27.245        
Residual balance   $ 147 CZK 3,242 $ 131 € 119    
Net cumulative change to goodwill due to foreign currency translation   $ 16