Revenue - Narrative (Details) - USD ($)	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative adjustment from comparative periods	$ (142,904,000)	$ (181,542,000)
Contract liabilities	36,100,000	40,900,000
Package revenues recognized	33,100,000
Advance deposits acquired in the business combination	36,058,000	43,884,000
Sagicor
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Advance deposits acquired in the business combination	$ 5,800,000
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative adjustment from comparative periods		$ 0

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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