Earnings per Share and Unit (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
Earnings Per Share Basic [Line Items]
Weighted average common shares/units outstanding for basic EPS/EPU	169,671,000	167,559,000	169,081,000	167,512,000
Weighted average common shares/units outstanding for diluted EPS/EPU	169,970,000	167,944,000	169,356,000	167,834,000
Income per common share - basic	$ 0.07	$ 0.34	$ 0.04	$ 1.19
Income per common share - diluted	$ 0.07	$ 0.34	$ 0.04	$ 1.19
Weighted Average Limited Partnership Units Outstanding, Basic	765,046	405,934	765,046	368,854
Partnership Interest [Member]
Earnings Per Share Basic [Line Items]
Weighted average common shares/units outstanding for basic EPS/EPU	170,436,000	167,965,000	169,846,000	167,881,000
Weighted average common shares/units outstanding for diluted EPS/EPU	170,735,000	168,350,000	170,121,000	168,203,000
Income per common unit - basic	$ 0.07	$ 0.34	$ 0.04	$ 1.19
Income per common unit - diluted	$ 0.07	$ 0.34	$ 0.04	$ 1.19
Continuing Operations [Member]
Earnings Per Share Basic [Line Items]
Income attributable to common stockholders - basic	$ 12,688	$ 56,965	$ 6,402	$ 199,139
Income attributable to common stockholders - diluted	12,688	56,965	6,402	199,139
Continuing Operations [Member] | Partnership Interest [Member]
Earnings Per Share Basic [Line Items]
Income attributable to common stockholders - basic	12,745	57,122	6,431	199,595
Income attributable to common stockholders - diluted	$ 12,745	$ 57,122	$ 6,431	$ 199,595