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Commitments and Contingencies - Letters of Credit (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Other Commitments [Line Items]    
LOC Outstanding $ 12,034 $ 11,625
Restricted cash 727 2,527
Restricted cash, long-term 10,980 8,771
Investment securities, restricted, long-term 336 336
Contract performance - equipment systems    
Other Commitments [Line Items]    
LOC Outstanding 5,556 7,247
Restricted cash 727 2,527
Restricted cash, long-term 4,830 4,721
Investment securities, restricted, long-term 0 0
Royalty Award    
Other Commitments [Line Items]    
LOC Outstanding 6,150 4,050
Restricted cash 0 0
Restricted cash, long-term 6,150 4,050
Investment securities, restricted, long-term 0 0
Other    
Other Commitments [Line Items]    
LOC Outstanding 328 328
Restricted cash 0 0
Restricted cash, long-term 0 0
Investment securities, restricted, long-term $ 336 $ 336