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Business combinations - Narrative (Details)
6 Months Ended
Jun. 01, 2018
USD ($)
unit
Jun. 30, 2018
USD ($)
shares
Jun. 07, 2018
USD ($)
Dec. 31, 2017
USD ($)
shares
Jun. 30, 2017
shares
Dec. 31, 2016
shares
Business Acquisition [Line Items]            
Transaction costs related to issuance of debt   $ 4,915,000   $ 5,583,000    
Ordinary Shares            
Business Acquisition [Line Items]            
Shares outstanding (in shares) | shares   130,478,993   110,297,697 110,109,076 50,481,822
Term Loan            
Business Acquisition [Line Items]            
Transaction costs related to issuance of debt   $ 4,915,000   $ 5,583,000    
Term Loan | Amendment            
Business Acquisition [Line Items]            
Transaction costs related to issuance of debt   1,300,000        
Face amount   100,000,000.0 $ 100,000,000.0      
Sagicor            
Business Acquisition [Line Items]            
Total purchase consideration $ 308,528,000          
Transaction costs related to the acquisition   $ 2,000,000        
Sagicor | Jewel Grande Montego Bay, One of the Towers in Multi-Tower Condominium and Spa            
Business Acquisition [Line Items]            
Number of units acquired | unit 88