Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Percentage of investments in subsidiaries	100.00%
Asset impairment charges	$ 58,476,000	$ 17,162,000	$ 185,067,000
Minimum percentage of likelihood of realization of tax benefits (greater than)	50.00%
Foreign currency exchange gain (loss)	$ (5,000)	(8,857,000)	$ 0
Other assets, net	122,922,000	144,341,000
Senior unsecured debt, net	1,063,950,000	1,450,606,000
Mortgage notes payable, net	$ 77,717,000	246,510,000
Accounting Standards Update 2015-03
Property, Plant and Equipment [Line Items]
Other assets, net		144,341,000
Senior unsecured debt, net		1,450,606,000
Mortgage notes payable, net		246,510,000
Originally Reported | Accounting Standards Update 2015-03
Property, Plant and Equipment [Line Items]
Other assets, net		157,549,000
Senior unsecured debt, net		1,460,592,000
Mortgage notes payable, net		249,732,000
Effect of Change | Accounting Standards Update 2015-03
Property, Plant and Equipment [Line Items]
Other assets, net		(13,208,000)
Senior unsecured debt, net		(9,986,000)
Mortgage notes payable, net		(3,222,000)
Australia Portfolio
Property, Plant and Equipment [Line Items]
Foreign currency exchange gain (loss)		8,900,000
Foreign currency translation adjustments		0
Foreign Currency Translation Adjustments
Property, Plant and Equipment [Line Items]
Total amounts reclassified		(63,207,000)
Foreign Currency Translation Adjustments | Australia Portfolio
Property, Plant and Equipment [Line Items]
Total amounts reclassified		$ (63,200,000)
Maximum
Property, Plant and Equipment [Line Items]
Maximum percentage of investment accounted for under equity method of accounting	50.00%
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Maximum | Personal property
Property, Plant and Equipment [Line Items]
Estimated useful life	12 years