Earnings Per Share ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator
Net income									$ 102,554	$ 68,972	$ 161,673
Net income attributable to noncontrolling interests									(5,734)	(8,952)	(15,543)
Net income attributable to the Company	$ 26,891	$ 46,371	$ 15,734	$ 7,824	$ 11,749	$ 74,028	$ 7,816	$ (33,573)	96,820	60,020	146,130
Allocation of earnings to participating securities									(1,190)	(1,106)	(757)
Numerator for basic and diluted EPS—net income attributable to common stockholders									$ 95,630	$ 58,914	$ 145,373
Denominator
Denominator for basic EPS—weighted average number of common shares outstanding (shares)									141,340,000	141,142,000	141,877,000
Effect of dilutive securities
Share and unit based compensation (shares)									0	2,000	36,000
Denominator for diluted EPS—weighted average number of common shares outstanding (shares)									141,340,000	141,144,000	141,913,000
EPS—net income attributable to common stockholders:
Basic (dollars per share)	$ 0.19	$ 0.33	$ 0.11	$ 0.05	$ 0.08	$ 0.52	$ 0.05	$ (0.24)	$ 0.68	$ 0.42	$ 1.02
Diluted (dollars per share)	$ 0.19	$ 0.33	$ 0.11	$ 0.05	$ 0.08	$ 0.52	$ 0.05	$ (0.24)	$ 0.68	$ 0.42	$ 1.02
Convertible preferred units
Antidilutive securities
Antidilutive securities (shares)									90,619	90,619	90,619
Partnership unit
Antidilutive securities
Antidilutive securities (shares)									10,415,291	10,360,390	10,416,321