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Shareholders' Equity - Class A Common Share Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Class of Stock [Line Items]
Proceeds from issuance of shares		$ 350,612	$ 1
Stock issuance costs		$ 236	$ 0
Class A common shares
Class of Stock [Line Items]
Common shares, par value (in USD per share)	$ 0.01	$ 0.01		$ 0.01
Underwritten Public Offering | Class A common shares
Class of Stock [Line Items]
Shares issued during period (in shares)	14,842,982
Common shares, par value (in USD per share)	$ 0.01	$ 0.01
Proceeds from issuance of shares	$ 336,500
Stock issuance costs	$ 600

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