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Commitments and Contingencies - Letters of Credit (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other Commitments [Line Items]    
LOC Outstanding $ 15,505 $ 12,034
Restricted cash 13,736 728
Restricted cash, long-term 0 10,980
Investment securities, restricted, long-term 0 336
Letter of Credit    
Other Commitments [Line Items]    
Utilization of LOC Availability 1,776 0
Long-term Debt, Fiscal Year Maturity    
Expiration of Letters of Credit - Less than 1 year 10,855  
Expiration of Letters of Credit - 1-3 years 4,650  
Expiration of Letters of Credit - 4-5 years 0  
Expiration of Letters of Credit - After 5 years 0  
Contract performance - equipment systems    
Other Commitments [Line Items]    
LOC Outstanding 1,855 5,556
Restricted cash 86 728
Restricted cash, long-term 0 4,830
Investment securities, restricted, long-term 0 0
Contract performance - equipment systems | Letter of Credit    
Other Commitments [Line Items]    
Utilization of LOC Availability 1,776 0
Royalty award    
Other Commitments [Line Items]    
LOC Outstanding 7,150 6,150
Restricted cash 7,150 0
Restricted cash, long-term 0 6,150
Investment securities, restricted, long-term 0 0
Royalty award | Letter of Credit    
Other Commitments [Line Items]    
Utilization of LOC Availability 0 0
Other    
Other Commitments [Line Items]    
LOC Outstanding 6,500 328
Restricted cash 6,500 0
Restricted cash, long-term 0 0
Investment securities, restricted, long-term 0 336
Other | Letter of Credit    
Other Commitments [Line Items]    
Utilization of LOC Availability $ 0 $ 0