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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Preferred Stock and Preferred Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shareholders Equity [Line Items]
Preferred stock authorized (shares)	15,000,000
Preferred stock, par value (USD per share)	$ 0.01
Issuance of common stock and restricted common stock (shares)	727,812	348,809	335,417
Series E preferred stock
Shareholders Equity [Line Items]
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Issuance of common stock and restricted common stock (shares)	6,900,000	6,900,000
Preferred stock dividend rate (as a percent)	6.625%	6.625%
Preferred stock, liquidation preference per share (USD per share)	$ 250.00
Depositary shares, liquidation preference (USD per share)	25
Dividends in arrears per share (USD per share)	16.5625
Dividends in arrears per depositary share (USD per share)	1.65625
Redemption price per share (USD per share)	250
7.375% Series D Cumulative Redeemable Preferred Stock
Shareholders Equity [Line Items]
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock dividend rate (as a percent)	7.375%	7.375%
Preferred stock, liquidation preference per share (USD per share)	$ 250
Depositary shares, liquidation preference (USD per share)	25
Dividends in arrears per share (USD per share)	18.4375
Dividends in arrears per depositary share (USD per share)	1.84375
Redemption price per share (USD per share)	$ 250
Depositary shares outstanding (shares)	18,150,000	18,150,000

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