Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Narrative (Details)

v3.19.3
Commitments and Contingencies - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
vessel
Sep. 30, 2019
USD ($)
vessel
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Number of multi-purpose service vessels | vessel 2 2  
Net contract asset $ 12.5 $ 12.5 $ 12.5
Operating lease, term of contract 15 years 9 months 29 days 15 years 9 months 29 days  
Operating lease, weighted-average discount rate (percentage) 7.50% 7.50%  
Operating lease payments $ 0.2 $ 0.5