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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 12, 2020
Dec. 31, 2017
Feb. 20, 2020
Subsequent Events      
Proceeds from sale of ordinary shares   $ 1  
Subsequent Events      
Subsequent Events      
Number of shares sold 5,500,000    
Share price (in dollars per share) $ 27.00    
Proceeds from sale of ordinary shares $ 148,500    
Subsequent Events | Norecourse 2035 notes      
Subsequent Events      
Principal amount     $ 400,000
Interest rate (as a percent)     9.50%
Percentage of note to be sold     95.00%
Percentage of note to be retained     5.00%
Percentage of equity interest     63.75%