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Share Capital - Equity Compensation Awards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 27, 2012
Jun. 26, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock available for issuance (in shares)       39,806,100 23,306,100
Share-based compensation $ 1,430 $ 8,299 $ 9,775    
Unrecognized compensation cost $ 6,700 9,200      
Weighted average period of recognition 1 year 8 months 12 days        
Weighted average remaining contractual term 2 years 3 months 18 days        
Performance Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity awards granted (as a percent) 80.00%        
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity awards granted (as a percent) 20.00%        
General and Administrative Expense          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation $ 1,400 $ 8,300 $ 9,800