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Basis of Presentation - Statement of Beneficiaries' Equity (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity | $ 1,702,437 | $ 1,729,665 | $ 1,760,463 | $ 1,811,028 | $ 1,756,294 | $ 1,830,525 | $ 1,847,251 | $ 1,826,870
Additional Paid-in Capital |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity | 3,189,350 | 3,188,239 | 3,186,774 | 3,200,312 | 3,223,318 | 3,222,585 | 3,221,560 | 3,218,077
Cumulative Earnings |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity | 787,789 | 781,017 | 774,812 | 775,625 | 654,744 | 697,916 | 685,166 | 641,093
Noncontrolling Interests |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity | $ 11,695 | $ 11,846 | 12,025 | 12,201 | 16,669 | 17,246 | 17,375 | 17,258
As Previously Reported |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  | 1,832,573 |  |  |  |
As Previously Reported | Additional Paid-in Capital |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  | 3,187,312 | 3,200,850 | 3,223,817 | 3,223,072 | 3,222,047 | 3,218,564
As Previously Reported | Cumulative Earnings |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  | 795,186 | 796,513 | 674,599 | 717,515 | 704,506 | 660,174
As Previously Reported | Noncontrolling Interests |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  | 12,142 | 12,320 | 16,824 | 17,410 | 17,538 | 17,420
Adjustments |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  | (21,545) |  |  |  |
Adjustments | Additional Paid-in Capital |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  | (538) | (538) | (499) | (487) | (487) | (487)
Adjustments | Cumulative Earnings |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  | (20,374) | (20,888) | (19,855) | (19,599) | (19,340) | (19,081)
Adjustments | Noncontrolling Interests |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ (117) | $ (119) | $ (155) | $ (164) | $ (163) | $ (162)

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