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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Allocations of Dividends and Declared and Paid for Income Tax Purposes (Details) - USD ($) $ / shares in Units, $ in Thousands							3 Months Ended	12 Months Ended
	Jan. 16, 2019	Oct. 16, 2018	Jul. 16, 2018	Apr. 17, 2018	Jan. 16, 2018	Jan. 16, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shareholders Equity [Line Items]
Common stock cash dividends per share (USD per share)		$ 0.200	$ 0.200	$ 0.20	$ 0.20	$ 0.265
Cash distributions paid							$ 12,949
Accrued dividends and distributions payable							$ 34,217	$ 34,217
Subsequent Event
Shareholders Equity [Line Items]
Common stock cash dividends per share (USD per share)	$ 0.075
Tax Year 2019 | Subsequent Event
Shareholders Equity [Line Items]
Common stock cash dividends per share (USD per share)	$ 0.075
Tax Year 2018
Shareholders Equity [Line Items]
Common stock cash dividends per share (USD per share)					$ 0.20
Tax Year 2016
Shareholders Equity [Line Items]
Common stock cash dividends per share (USD per share)						0.081
Tax Year 2017
Shareholders Equity [Line Items]
Common stock cash dividends per share (USD per share)						$ 0.184
Common Stock
Shareholders Equity [Line Items]
Dividends declared (USD per share)								$ 0.80000	$ 0.97970004	$ 0.876
Allocations								100.00%	100.00%	100.00%
Common Stock | Ordinary income
Shareholders Equity [Line Items]
Allocations								82.83%	85.37%	100.00%
Common Stock | Capital gains 25% rate
Shareholders Equity [Line Items]
Allocations								0.00%	0.00%	0.00%
Common Stock | Return of capital
Shareholders Equity [Line Items]
Allocations								17.17%	14.63%	0.00%
Series D preferred stock
Shareholders Equity [Line Items]
Dividends declared (USD per share)								$ 18.4375	$ 18.4375	$ 18.4375
Series E preferred stock
Shareholders Equity [Line Items]
Dividends declared (USD per share)								$ 16.562500	$ 16.562500	$ 16.562500
Preferred Stock
Shareholders Equity [Line Items]
Allocations								100.00%	100.00%	100.00%
Preferred Stock | Ordinary income
Shareholders Equity [Line Items]
Allocations								100.00%	100.00%	100.00%
Preferred Stock | Capital gains 25% rate
Shareholders Equity [Line Items]
Allocations								0.00%	0.00%	0.00%

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

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Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP).

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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