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Summary of Significant Accounting Policies - Foreign Currency Translation (Details)
€ in Thousands, CZK in Thousands, $ in Thousands
12 Months Ended
Jan. 01, 2002
Dec. 31, 2016
USD ($)
Jun. 01, 2015
CZK
Jan. 01, 2003
CZK
Jan. 01, 2003
EUR (€)
Jan. 01, 2003
USD ($)
Jun. 30, 1998
CZK
Impact of foreign currency translation on goodwill              
Residual balance   $ 4,857   CZK 124,509 € 119 $ 3,710  
Net cumulative change to goodwill due to foreign currency translation   $ 1,147          
Period over which goodwill was amortized 15 years            
Pilsen reporting unit              
Impact of foreign currency translation on goodwill              
Applicable Foreign Exchange Rate ("FX")   25.639         33.883
Residual balance   $ 4,020       3,042 CZK 103,072
Net cumulative change to goodwill due to foreign currency translation   $ 978          
South-Moravia reporting unit              
Impact of foreign currency translation on goodwill              
Applicable Foreign Exchange Rate ("FX")   25.639         33.883
Residual balance   $ 710       537 CZK 18,195
Net cumulative change to goodwill due to foreign currency translation   $ 173          
Lower Saxony reporting unit              
Impact of foreign currency translation on goodwill              
Applicable Foreign Exchange Rate ("FX")   25.639 27.245        
Residual balance   $ 127 CZK 3,242   € 119 $ 131  
Net cumulative change to goodwill due to foreign currency translation   $ (4)