Business combination - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 01, 2018	Dec. 31, 2018	Dec. 31, 2017
Net assets acquired
Goodwill		$ 83,656	$ 51,731
Sagicor
Business Acquisition [Line Items]
Total purchase consideration	$ 308,528
Net assets acquired
Working capital	(1,665)
Property and equipment	304,299
Identifiable intangible assets and liabilities	(449)
Deferred income taxes	(25,582)
Goodwill	31,925
Total net assets acquired	308,528
As Previously Reported | Sagicor
Business Acquisition [Line Items]
Total purchase consideration	308,528
Net assets acquired
Working capital	(1,665)
Property and equipment	309,452
Identifiable intangible assets and liabilities	2,197
Deferred income taxes	(28,753)
Goodwill	27,297
Total net assets acquired	308,528
Adjustments | Sagicor
Business Acquisition [Line Items]
Total purchase consideration	0
Net assets acquired
Working capital	0
Property and equipment	(5,153)
Identifiable intangible assets and liabilities	(2,646)
Deferred income taxes	3,171
Goodwill	4,628
Total net assets acquired	$ 0