Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Aug. 23, 2016	Sep. 30, 2016	Sep. 30, 2015
Class of Stock [Line Items]
Gross proceeds from sale of shares	$ 621,800	$ 611,278	$ 0
Common shares | Class A common shares
Class of Stock [Line Items]
Issuance of common shares (in shares)	29,610,854	29,611,000
Common shares issued (in dollars per share)	$ 21.00
Qatar Investment Authority, affiliate
Class of Stock [Line Items]
Interest held by affiliate of QIA	9.90%
Qatar Investment Authority, affiliate | Common shares | Class A common shares
Class of Stock [Line Items]
Interest held by affiliate of QIA	19.40%