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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] |
Summary of Activity in Accumulated Other Comprehensive Income | The following table sets forth the activity in accumulated other comprehensive income for the years ended December 31, 2018, 2017 and 2016 (in thousands):
|  | Gains or Losses on Derivative Instruments |
Balance at January 1, 2018 |  | $ | 2,614 |
Other comprehensive loss before reclassifications |  |  | (2,659 | )
Reclassification of realized interest on swap agreements |  |  | 71 |
Net current period other comprehensive loss |  |  | (2,588 | )
Net current period other comprehensive loss attributable to noncontrolling interests |  |  | 490 |
Balance at December 31, 2018 |  | $ | 516 |
Balance at January 1, 2017 |  | $ | (798 | )
Other comprehensive income before reclassifications |  |  | 634 |
Reclassification of realized interest on swap agreements |  |  | 3,317 |
Net current period other comprehensive income |  |  | 3,951 |
Net current period other comprehensive income attributable to noncontrolling interests |  |  | (539 | )
Balance at December 31, 2017 |  | $ | 2,614 |
Balance at January 1, 2016 |  | $ | (4,463 | )
Other comprehensive loss before reclassifications |  |  | (646 | )
Reclassification of realized interest on swap agreements |  |  | 4,576 |
Net current period other comprehensive income |  |  | 3,930 |
Net current period other comprehensive income attributable to noncontrolling interests |  |  | (265 | )
Balance at December 31, 2016 |  | $ | (798 | )
Summary of Change in Noncontrolling Interest | The following table summarizes the change in the noncontrolling interests for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):
|  | Noncontrolling Interests in Operating Partnership (a) |  |  | Noncontrolling Interests in Partially-Owned Affiliates (b) |  |  | Total |
Balance at January 1, 2018 |  | $ | 102,921 |  |  | $ | 545,519 |  |  | $ | 648,440 |
Distributions declared of $1.09 per Common OP Unit |  |  | (6,888 | ) |  |  | — |  |  |  | (6,888 | )
Net income (loss) for the year ended December 31, 2018 |  |  | 2,572 |  |  |  | (49,709 | ) |  |  | (47,137 | )
Conversion of 117,978 Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  | (2,068 | ) |  |  | — |  |  |  | (2,068 | )
Other comprehensive loss - unrealized loss on valuation of swap agreements |  |  | (129 | ) |  |  | (681 | ) |  |  | (810 | )
Reclassification of realized interest expense on swap agreements |  |  | (3 | ) |  |  | 323 |  |  |  | 320 |
Noncontrolling interest contributions |  |  | — |  |  |  | 47,560 |  |  |  | 47,560 |
Noncontrolling interest distributions |  |  | — |  |  |  | (24,793 | ) |  |  | (24,793 | )
Employee Long-term Incentive Plan Unit Awards |  |  | 12,374 |  |  |  | — |  |  |  | 12,374 |
Rebalancing adjustment (c) |  |  | (4,556 | ) |  |  | — |  |  |  | (4,556 | )
Balance at December 31, 2018 |  | $ | 104,223 |  |  | $ | 518,219 |  |  | $ | 622,442 |
Balance at January 1, 2017 |  | $ | 95,422 |  |  | $ | 494,126 |  |  | $ | 589,548 |
Distributions declared of $1.05 per Common OP Unit |  |  | (6,453 | ) |  |  | — |  |  |  | (6,453 | )
Net income (loss) for the year ended December 31, 2017 |  |  | 4,159 |  |  |  | (1,321 | ) |  |  | 2,838 |
Conversion of 81,453 Common OP Units and 5,000 Preferred OP Units to Common Shares by limited partners of the Operating Partnership |  |  | (1,541 | ) |  |  | — |  |  |  | (1,541 | )
Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements |  |  | 85 |  |  |  | (232 | ) |  |  | (147 | )
Reclassification of realized interest expense on swap agreements |  |  | 141 |  |  |  | 545 |  |  |  | 686 |
Noncontrolling interest contributions |  |  | — |  |  |  | 85,206 |  |  |  | 85,206 |
Noncontrolling interest distributions |  |  | — |  |  |  | (32,805 | ) |  |  | (32,805 | )
Employee Long-term Incentive Plan Unit Awards |  |  | 10,457 |  |  |  | — |  |  |  | 10,457 |
Rebalancing adjustment (c) |  |  | 651 |  |  |  | — |  |  |  | 651 |
Balance at December 31, 2017 |  | $ | 102,921 |  |  | $ | 545,519 |  |  | $ | 648,440 |
Balance at January 1, 2016 |  | $ | 96,340 |  |  | $ | 324,526 |  |  | $ | 420,866 |
Distributions declared of $1.16 per Common OP Unit |  |  | (6,753 | ) |  |  | — |  |  |  | (6,753 | )
Net income for the year ended December 31, 2016 |  |  | 5,002 |  |  |  | 56,814 |  |  |  | 61,816 |
Conversion of 351,250 Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  | (7,892 | ) |  |  | — |  |  |  | (7,892 | )
Issuance of Common and Preferred OP Units to acquire real estate |  |  | 31,429 |  |  |  | — |  |  |  | 31,429 |
Acquisition of noncontrolling interests |  |  | — |  |  |  | (25,925 | ) |  |  | (25,925 | )
Other comprehensive loss - unrealized loss on valuation of swap agreements |  |  | (43 | ) |  |  | (289 | ) |  |  | (332 | )
Change in control of previously unconsolidated investment |  |  | — |  |  |  | (75,713 | ) |  |  | (75,713 | )
Reclassification of realized interest expense on swap agreements |  |  | 223 |  |  |  | 374 |  |  |  | 597 |
Noncontrolling interest contributions |  |  | — |  |  |  | 295,108 |  |  |  | 295,108 |
Noncontrolling interest distributions |  |  | — |  |  |  | (80,769 | ) |  |  | (80,769 | )
Employee Long-term Incentive Plan Unit Awards |  |  | 12,768 |  |  |  | — |  |  |  | 12,768 |
Rebalancing adjustment (c) |  |  | (35,652 | ) |  |  | — |  |  |  | (35,652 | )
Balance at December 31, 2016 |  | $ | 95,422 |  |  | $ | 494,126 |  |  | $ | 589,548 |
(a) | Noncontrolling interests in the Operating Partnership are comprised of (i) the limited partners’ 3,329,640, 3,328,873 and 3,308,875 Common OP Units at December 31, 2018, 2017 and 2016, respectively; (ii) 188 Series A Preferred OP Units at December 31, 2018, 2017 and 2016; (iii) 136,593 Series C Preferred OP Units at December 31, 2018, 2017 and 2016; and (iv) 2,569,044, 2,274,147 and 1,997,099 LTIP units at December 31, 2018, 2017 and 2016, respectively, as discussed in Share Incentive Plan (). Distributions declared for Preferred OP Units are reflected in net income (loss) in the table above.
(b) | Noncontrolling interests in partially-owned affiliates comprise third-party interests in Funds II, III, IV and V, and Mervyns I and II, and six other subsidiaries.
(c) | Adjustment reflects the difference between the fair value of the consideration received or paid and the book value of the Common Shares, Common OP Units, Preferred OP Units, and LTIP Units involving changes in ownership (the “Rebalancing”).

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