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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) property | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment property | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Rental income |  |  |  |  |  |  |  |  | $ 198,941 | $ 152,814 | $ 158,632
Depreciation and amortization |  |  |  |  |  |  |  |  | 104,934 | 70,011 | 60,751
Interest expense |  |  |  |  |  |  |  |  | 58,978 | 34,645 | 37,297
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 23,371 | 39,449 | 37,330
Net income (loss) | $ 24,944 | $ 13,285 | $ 6,108 | $ 19,971 | $ 34,236 | $ 326 | $ 26,155 | $ 73,875 | 64,308 | 134,592 | 149,970
Net loss (income) attributable to noncontrolling interests | 4,032 | $ 418 | $ (5,952) | $ 4,340 | 14,415 | $ (5,786) | $ 8,237 | $ 44,950 | 2,838 | 61,816 | 84,262
Additional paid-in capital | 1,596,514 |  |  |  | 1,594,926 |  |  |  | 1,596,514 | 1,594,926 |
Noncontrolling interests | 648,440 |  |  |  | 589,548 |  |  |  | 648,440 | 589,548 |
Deferred rent receivables | 37,300 |  |  |  | 34,900 |  |  |  | 37,300 | 34,900 |
Allowance for doubtful accounts receivable | 5,900 |  |  |  | 5,700 |  |  |  | 5,900 | 5,700 |
Adjustment to deferred tax assets |  |  |  |  |  |  |  |  | 2,000 |  |
Lease future payment obligation | 207,167 |  |  |  |  |  |  |  | 207,167 |  |
Capitalized internal leasing costs | $ 1,000 |  |  |  | 1,100 |  |  |  | 1,000 | 1,100 | 1,400
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | 10,082 | (610,970) | (354,503)
Acquisition related costs |  |  |  |  |  |  |  |  | 2,100 | 8,200 |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  |  |  |  | $ 119,833 | $ 111,760 | 113,598
Buildings |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  | 40 years |  |
Building Improvements |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  | 15 years |  |
Furniture and fixtures | Minimum |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  | 5 years |  |
Furniture and fixtures | Maximum |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  | 20 years |  |
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity interest held by Operating Partnership |  |  |  |  |  |  |  |  | 95.00% | 95.00% |
Remaining funds rate of distribution to operating partnership (in percent) | 20.00% |  |  |  |  |  |  |  | 20.00% |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | $ 23,371 | $ 39,449 | 37,330
Institutional Investors |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining funds rate of distribution to all partners (in percent) | 80.00% |  |  |  |  |  |  |  | 80.00% |  |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  |  | (2,100) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,700 |
Interest expense |  |  |  |  |  |  |  |  |  | 700 |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 200 |
Net income (loss) |  |  |  |  | (4,200) |  |  |  |  | (4,200) |
Net loss (income) attributable to noncontrolling interests |  |  |  |  | (1,600) |  |  |  |  | (1,600) |
Additional paid-in capital |  |  |  |  | 35,700 |  |  |  |  | 35,700 | 31,800
Noncontrolling interests |  |  |  |  | $ (35,700) |  |  |  |  | (35,700) | $ (31,800)
Pro Forma | Accounting Standards Update 2016-15 |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | $ 6,300 | 0 |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  |  |  |  | $ (6,300) | 0 |
Core Portfolio |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property | 118 |  |  |  |  |  |  |  | 118 |  |
Properties owned percentage | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Acquisition related costs |  |  |  |  |  |  |  |  | $ 1,200 | 5,500 |
Opportunity Funds |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property | 58 |  |  |  |  |  |  |  | 58 |  |
Core Portfolio and Opportunity Funds |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property | 176 |  |  |  |  |  |  |  | 176 |  |
Acquisition related costs |  |  |  |  |  |  |  |  | $ 2,100 | $ 8,200 |

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