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Summary of Significant Accounting Policies - Foreign Currency Translation (Details)
€ in Thousands, CZK in Thousands, $ in Thousands
6 Months Ended
Jan. 01, 2002
Jun. 30, 2017
USD ($)
Jun. 01, 2015
CZK
Jan. 01, 2003
USD ($)
Jan. 01, 2003
EUR (€)
Jun. 30, 1998
CZK
Impact of foreign currency translation on goodwill            
Residual balance   $ 5,425   $ 3,710 € 119 CZK 124,509
Net cumulative change to goodwill due to foreign currency translation   $ 1,715        
Period over which goodwill was amortized 15 years          
Pilsen reporting unit            
Impact of foreign currency translation on goodwill            
Applicable Foreign Exchange Rate ("FX")   22.952       33.883
Residual balance   $ 4,491   3,042   CZK 103,072
Net cumulative change to goodwill due to foreign currency translation   $ 1,449        
South-Moravia reporting unit            
Impact of foreign currency translation on goodwill            
Applicable Foreign Exchange Rate ("FX")   22.952       33.883
Residual balance   $ 793   537   CZK 18,195
Net cumulative change to goodwill due to foreign currency translation   $ 256        
Lower Saxony reporting unit            
Impact of foreign currency translation on goodwill            
Applicable Foreign Exchange Rate ("FX")   22.952 27.245      
Residual balance   $ 141 CZK 3,242 $ 131 € 119  
Net cumulative change to goodwill due to foreign currency translation   $ 10