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SEGMENT REPORTING Income Statement (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Revenues | $ 54,768 | $ 56,852 | $ 53,161 | $ 52,481 | $ 51,156 | $ 47,660 | $ 49,511 | $ 46,685 | $ 217,262 | $ 195,012 | $ 168,286
Property operating expenses, other operating and real estate taxes |  |  |  |  |  |  |  |  | (58,482) | (51,671) | (46,553)
General and administrative expenses |  |  |  |  |  |  |  |  | (30,368) | (27,433) | (25,555)
Depreciation and amortization |  |  |  |  |  |  |  |  | (60,751) | (49,645) | (40,299)
Impairment of asset |  |  |  |  |  |  |  |  | (5,000) | 0 | (1,500)
Operating income |  |  |  |  |  |  |  |  | 62,661 | 66,263 | 54,379
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 13,287 | 8,723 | 12,382
Gain on sale of unconsolidated affiliates |  |  |  |  |  |  |  |  | 24,043 | 102,855 | 0
Loss on debt extinguishment |  |  |  |  |  |  |  |  | (135) | (335) | (765)
Interest and other finance expense |  |  |  |  |  |  |  |  | (37,162) | (39,091) | (39,474)
Gain on disposition of property |  |  |  |  |  |  |  |  | 89,063 | 13,138 | 0
Income tax provision |  |  |  |  |  |  |  |  | (1,787) | (629) | (19)
Income from continuing operations |  |  |  |  |  |  |  |  | 149,970 | 150,924 | 26,503
Discontinued operations |  |  |  |  |  |  |  |  |  |  |
Operating income from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 6,818
Impairment of asset |  |  |  |  |  |  |  |  | 0 | 0 | (6,683)
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 0 | 0 | (800)
Gain on disposition of properties |  |  |  |  |  |  |  |  | 0 | 1,222 | 18,802
Income from discontinued operations |  |  |  |  |  |  |  |  | 0 | 1,222 | 18,137
Net income |  |  |  |  |  |  |  |  | 149,970 | 152,146 | 44,640
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | (84,262) | (80,059) | 7,523
Income from discontinued operations |  |  |  |  |  |  |  |  | 0 | (1,023) | (12,048)
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (84,262) | (81,082) | (4,525)
Net income attributable to Common Shareholders | $ 8,890 | $ 13,776 | $ 26,495 | $ 16,547 | $ 9,441 | $ 28,564 | $ 11,464 | $ 21,595 | 65,708 | 71,064 | 40,115
Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 150,015 | 125,022 | 110,355
Property operating expenses, other operating and real estate taxes |  |  |  |  |  |  |  |  | (37,259) | (33,097) | (29,040)
General and administrative expenses |  |  |  |  |  |  |  |  | (28,600) | (24,853) | (24,387)
Depreciation and amortization |  |  |  |  |  |  |  |  | (46,223) | (35,875) | (28,989)
Impairment of asset |  |  |  |  |  |  |  |  | (5,000) |  | (1,500)
Operating income |  |  |  |  |  |  |  |  | 32,933 | 31,197 | 26,439
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 1,169 | (77) | (99)
Gain on sale of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 | 0 |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 0 | (3) | (309)
Interest and other finance expense |  |  |  |  |  |  |  |  | (27,945) | (27,021) | (26,158)
Gain on disposition of property |  |  |  |  |  |  |  |  | 0 | 12,577 |
Income tax provision |  |  |  |  |  |  |  |  | (604) | (176) | 131
Income from continuing operations |  |  |  |  |  |  |  |  |  | 16,497 | 4
Discontinued operations |  |  |  |  |  |  |  |  |  |  |
Operating income from discontinued operations |  |  |  |  |  |  |  |  |  |  | 535
Impairment of asset |  |  |  |  |  |  |  |  |  |  | 0
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  | (145)
Gain on disposition of properties |  |  |  |  |  |  |  |  |  | 0 | 6,488
Income from discontinued operations |  |  |  |  |  |  |  |  |  | 0 | 6,878
Net income |  |  |  |  |  |  |  |  | 5,553 | 16,497 | 6,882
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | (140) | (3,213) | (1,002)
Income from discontinued operations |  |  |  |  |  |  |  |  |  | (9) | (2,406)
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (140) | (3,222) | (3,408)
Net income attributable to Common Shareholders |  |  |  |  |  |  |  |  | 5,413 | 13,275 | 3,474
Funds [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 49,048 | 54,659 | 46,131
Property operating expenses, other operating and real estate taxes |  |  |  |  |  |  |  |  | (21,223) | (18,574) | (17,513)
General and administrative expenses |  |  |  |  |  |  |  |  | (1,768) | (1,665) | (1,168)
Depreciation and amortization |  |  |  |  |  |  |  |  | (14,528) | (13,770) | (11,310)
Impairment of asset |  |  |  |  |  |  |  |  | 0 |  | 0
Operating income |  |  |  |  |  |  |  |  | 11,529 | 20,650 | 16,140
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 12,118 | 8,800 | 12,481
Gain on sale of unconsolidated affiliates |  |  |  |  |  |  |  |  | 24,043 | 102,855 |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | (135) | (332) | (456)
Interest and other finance expense |  |  |  |  |  |  |  |  | (9,217) | (12,070) | (13,316)
Gain on disposition of property |  |  |  |  |  |  |  |  | 89,063 | 561 |
Income tax provision |  |  |  |  |  |  |  |  | (1,183) | (453) | (150)
Income from continuing operations |  |  |  |  |  |  |  |  |  | 120,011 | 14,699
Discontinued operations |  |  |  |  |  |  |  |  |  |  |
Operating income from discontinued operations |  |  |  |  |  |  |  |  |  |  | 6,283
Impairment of asset |  |  |  |  |  |  |  |  |  |  | (6,683)
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  | (655)
Gain on disposition of properties |  |  |  |  |  |  |  |  |  | 1,222 | 12,314
Income from discontinued operations |  |  |  |  |  |  |  |  |  | 1,222 | 11,259
Net income |  |  |  |  |  |  |  |  | 126,218 | 121,233 | 25,958
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | (84,122) | (76,846) | 8,525
Income from discontinued operations |  |  |  |  |  |  |  |  |  | (1,014) | (9,642)
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (84,122) | (77,860) | (1,117)
Net income attributable to Common Shareholders |  |  |  |  |  |  |  |  | 42,096 | 43,373 | 24,841
Structuring Financing [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 18,199 | 15,331 | 11,800
Property operating expenses, other operating and real estate taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  | 0 | (915) | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of asset |  |  |  |  |  |  |  |  | 0 |  | 0
Operating income |  |  |  |  |  |  |  |  | 18,199 | 14,416 | 11,800
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on sale of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 | 0 |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest and other finance expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on disposition of property |  |  |  |  |  |  |  |  | 0 | 0 |
Income tax provision |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from continuing operations |  |  |  |  |  |  |  |  |  | 14,416 | 11,800
Discontinued operations |  |  |  |  |  |  |  |  |  |  |
Operating income from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0
Impairment of asset |  |  |  |  |  |  |  |  |  |  | 0
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  | 0
Gain on disposition of properties |  |  |  |  |  |  |  |  |  | 0 | 0
Income from discontinued operations |  |  |  |  |  |  |  |  |  | 0 | 0
Net income |  |  |  |  |  |  |  |  | 18,199 | 14,416 | 11,800
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from discontinued operations |  |  |  |  |  |  |  |  |  | 0 | 0
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Common Shareholders |  |  |  |  |  |  |  |  | $ 18,199 | $ 14,416 | $ 11,800

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