Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Rental revenue	$ 137,999	$ 141,071	$ 286,112	$ 284,488
Observatory revenue	86	32,895	19,630	53,464
Lease termination fees	1,033	363	1,244	751
Third-party management and other fees	301	331	647	651
Other revenue and fees	1,611	1,584	3,621	4,183
Total revenues	141,030	176,244	311,254	343,537
Operating expenses:
Property operating expenses	29,750	40,227	71,218	83,182
Ground rent expenses	2,332	2,332	4,663	4,663
General and administrative expenses	18,149	15,998	34,100	30,024
Observatory expenses	4,002	8,360	12,156	15,935
Real estate taxes	29,579	28,267	58,833	56,499
Impairment charge	4,101	0	4,101	0
Depreciation and amortization	52,783	44,821	98,876	90,919
Total operating expenses	140,696	140,005	283,947	281,222
Total operating income	334	36,239	27,307	62,315
Other income (expense):
Interest income	1,526	3,899	2,163	7,638
Interest expense	(23,928)	(20,597)	(43,546)	(41,286)
Loss on early extinguishment of debt	0	0	(86)	0
Income (loss) before income taxes	(22,068)	19,541	(14,162)	28,667
Income tax benefit (expense)	2,450	(611)	2,832	119
Net income (loss)	(19,618)	18,930	(11,330)	28,786
Private perpetual preferred unit distributions	(1,047)	(234)	(2,097)	(468)
Net (income) loss attributable to non-controlling interests	7,872	(7,609)	5,129	(11,554)
Net income (loss) attributable to common stockholders	$ (12,793)	$ 11,087	$ (8,298)	$ 16,764
Total weighted average shares:
Basic (in shares)	175,433	176,796	178,029	176,495
Diluted (in shares)	283,384	298,131	288,015	298,100
Earnings per share attributable to common stockholders:
Basic (in USD per share)	$ (0.07)	$ 0.06	$ (0.05)	$ 0.09
Diluted (in USD per share)	(0.07)	0.06	(0.05)	0.09
Dividends per share (in USD per share)	$ 0.105	$ 0.105	$ 0.210	$ 0.210