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Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Dividends [Abstract]
Operating loss carryforwards		$ 529,600
Common stock dividends declared	$ 35,076	$ 32,815	$ 25,324
Common stock dividends declared per share (in dollars per share)	$ 0.485	$ 0.43
Capital gains distribution	100.00%	100.00%
Unrecaptured Section 1250 gain percentage	18.31%
Common Stock
Dividends [Abstract]
Capital gains distribution		100.00%
Unrecaptured Section 1250 gain percentage		18.31%
7.65% Series G Cumulative Redeemable Preferred Stock, $0.001 par value
Dividends [Abstract]
Common stock dividends declared	$ 6,100	$ 6,100
7.50% Series I Cumulative Redeemable Preferred Stock, $0.001 par value
Dividends [Abstract]
Common stock dividends declared	9,400	9,400
8.00% Series D Cumulative Redeemable Preferred Stock, $0.001 par value
Dividends [Abstract]
Common stock dividends declared	$ 8,000	$ 8,000

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Capital Gains Distribution, Percentage

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Unrecaptured Section 1250 Gain, Percentage of Dividend

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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