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Subsequent Events (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 04, 2018
Jan. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Ultraco Debt Facility          
Subsequent Event [Line Items]          
Draw down amount     $ 61,200,000 $ 0 $ 0
Subsequent Event | Restricted Stock          
Subsequent Event [Line Items]          
Granted (in shares) 948,500        
Restricted shares granted, value $ 4,500,000        
Vesting period 3 years        
Subsequent Event | Ultraco Debt Facility | Ultraco          
Subsequent Event [Line Items]          
Draw down amount   $ 8,600,000