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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 |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 15, 2015 | Oct. 15, 2014 | Jul. 15, 2014 | Apr. 16, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Common stock cash dividends per share (in dollars per share) | $ 0.265 | $ 0.265 | $ 0.265 | $ 0.265 |  |  |
Dividends payable |  |  |  |  | $ 45,179 | $ 45,119 |
Common Stock |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Dividends declared (in usd per share) |  |  |  |  | $ 1.06 | $ 1.00 | $ 0.98
Allocations (percent) |  |  |  |  | 100.00% | 100.00% | 100.00%
Common Stock | Ordinary income |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Allocations (percent) |  |  |  |  | 100.00% | 100.00% | 100.00%
Common Stock | Capital gains 25% rate |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Allocations (percent) |  |  |  |  | 0.00% | 0.00% | 0.00%
Common Stock | Return of capital |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Allocations (percent) |  |  |  |  | 0.00% | 0.00% | 0.00%
Series D preferred stock |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Dividends declared (in usd per share) |  |  |  |  | $ 18.44 | $ 18.44 | $ 18.44
Series E preferred stock |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Dividends declared (in usd per share) |  |  |  |  | $ 16.56 | $ 16.56 | $ 16.56
Preferred Stock |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Allocations (percent) |  |  |  |  | 100.00% | 100.00% | 100.00%
Preferred Stock | Ordinary income |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Allocations (percent) |  |  |  |  | 100.00% | 100.00% | 100.00%
Preferred Stock | Capital gains 25% rate |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Allocations (percent) |  |  |  |  | 0.00% | 0.00% | 0.00%

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