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Borrowings - Letters of Credit (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
LC Outstanding $ 5,000 $ 9,005
Letter of Credit    
Debt Instrument [Line Items]    
Utilization of LOC Availability 10,733 1,776
Restricted Cash 0 7,236
Equipment Systems, ACI    
Debt Instrument [Line Items]    
LC Outstanding 800  
Contract performance - equipment systems    
Debt Instrument [Line Items]    
LC Outstanding 83 1,855
Contract performance - equipment systems | Letter of Credit    
Debt Instrument [Line Items]    
Utilization of LOC Availability 83 1,776
Restricted Cash 0 86
Royalty Award    
Debt Instrument [Line Items]    
LC Outstanding 10,650 7,150
Royalty Award | Letter of Credit    
Debt Instrument [Line Items]    
Utilization of LOC Availability 10,650 0
Restricted Cash $ 0 $ 7,150