Related party transactions - Transactions with Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Related Party Transaction [Line Items]
Total transactions with related parties	$ 4,849	$ 3,678	$ 9,517	$ 16,682
Hyatt franchise fees
Related Party Transaction [Line Items]
Total transactions with related parties	4,594	3,409	9,045	7,774
Lease payments
Related Party Transaction [Line Items]
Total transactions with related parties	255	269	472	578
Dividends on the Preferred Shares
Related Party Transaction [Line Items]
Total transactions with related parties	0	0	0	7,922
Deferred consideration accretion
Related Party Transaction [Line Items]
Total transactions with related parties	0	0	0	36
Interest expense on related party debt
Related Party Transaction [Line Items]
Total transactions with related parties	$ 0	$ 0	$ 0	$ 372