Equity - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator - Basic:
Net income (loss)	$ (12,269)	$ 26,784	$ (23,599)	$ 55,570
Private perpetual preferred unit distributions	(1,050)	(234)	(3,147)	(702)
Net income (loss) attributable to non-controlling interests	5,115	(10,668)	10,244	(22,222)
Earnings allocated to unvested shares	(24)	(13)	(60)	(33)
Net income (loss) attributable to common stockholders - basic	(8,228)	15,869	(16,562)	32,613
Numerator - Diluted:
Net income (loss)	(12,269)	26,784	(23,599)	55,570
Private perpetual preferred unit distributions	(1,050)	(234)	(3,147)	(702)
Earnings allocated to unvested shares	(24)	(13)	(60)	(33)
Net income (loss) attributable to common stockholders - diluted	$ (13,343)	$ 26,537	$ (26,806)	$ 54,835
Denominator:
Weighted average shares outstanding - basic (in shares)	173,048,000	178,352,000	176,299,000	177,428,000
Operating partnership units (in shares)	107,892,000	119,799,000	109,341,000	120,689,000
Effect of dilutive securities:
Stock-based compensation plans (in shares)	0	0	0	0
Weighted average shares outstanding - diluted (in shares)	280,940,000	298,151,000	285,640,000	298,117,000
Earnings per share:
Basic (in USD per share)	$ (0.05)	$ 0.09	$ (0.09)	$ 0.18
Diluted (in USD per share)	$ (0.05)	$ 0.09	$ (0.09)	$ 0.18
Antidilutive securities (in shares)	0	452,457	169,848	288,053