Earnings per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income per common unit - diluted
Weighted Average Limited Partnership Units Outstanding, Basic	349,902	154,170
Parent Company [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 52,660	$ (33,223)
Weighted average common units outstanding for basic EPU (in shares)	170,704,000	126,649,000
Weighted average common units outstanding for diluted EPU (in shares)	170,959,000	126,649,000
Income per common share/unit - basic:
Continuing operations (in dollars per share)	$ 0.31	$ (0.26)
Income per common share/unit - diluted:
Continuing operations (in dollars per share)	$ 0.31	$ (0.26)
Partnership Interest [Member]
Earnings Per Share [Abstract]
Weighted average common units outstanding for basic EPU (in shares)	171,054,000	126,803,000
Weighted average common units outstanding for diluted EPU (in shares)	171,309,000	126,803,000
Income per common unit - basic
Continuing operations (in dollars per share)	$ 0.31	$ (0.26)
Income per common unit - diluted
Continuing operations (in dollars per share)	$ 0.31	$ (0.26)
Continuing Operations [Member] | Parent Company [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 52,660	$ (33,223)
Net income for common stock unit/holders - diluted	52,660	(33,223)
Continuing Operations [Member] | Partnership Interest [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders	52,771	(33,242)
Net income for common stock unit/holders - diluted	$ 52,771	$ (33,242)