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Shareholders' Equity / Partners' Capital - Redemption of Series A and B Participating Preferred Shares (Details) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended	12 Months Ended
	Apr. 05, 2018 market shares	Oct. 03, 2017 market shares	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)	Sep. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Mar. 31, 2016 $ / shares
Class of Stock [Line Items]
Redemption of participating preferred shares | $						$ 32,215	$ 42,416	$ 0
Preferred shares, shares outstanding (in shares)						35,350,000	38,350,000
Preferred shares, par value (in dollars per share) | $ / shares						$ 0.01	$ 0.01
Conversion ratio		1.3106
Series C Preferred Stock
Class of Stock [Line Items]
Conversion of preferred units (in shares)	7,600,000
Cumulative annual cash dividend rate			5.50%			5.50%	5.50%	5.50%
Preferred shares, shares outstanding (in shares)						0	7,600,000
Class A common shares/units
Class of Stock [Line Items]
Common shares, par value (in dollars per share) | $ / shares						$ 0.01	$ 0.01		$ 0.01	$ 0.01	$ 0.01
Redemption of Series A and B participating preferred shares (in shares)	10,848,827
Stock exchange ratio	1.4275
Percent of cumulative change in value of an index	50.00%	50.00%				50.00%
Number of markets used in calculation | market	20	20
Maximum internal rate of return	9.00%
Redemption of participating preferred shares | $						$ 32,200
Preferred stock redemption premium | $						$ 42,400
Series A Participating Preferred Stock
Class of Stock [Line Items]
Cumulative annual cash dividend rate		5.00%		5.00%			5.00%	5.00%
Redemption of Series A and B participating preferred shares (in shares)		12,398,276
Preferred shares, shares outstanding (in shares)		5,060,000
Preferred shares, par value (in dollars per share) | $ / shares						$ 0.01
Series B Participating Preferred Stock
Class of Stock [Line Items]
Cumulative annual cash dividend rate		5.00%			5.00%	5.00%	5.00%	5.00%
Preferred shares, shares outstanding (in shares)		4,400,000

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