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Joint Ventures and Variable Interest Entities - Equity in Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Financial Information |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of joint ventures | $ 14,000 | $ 28,600 | $ 25,900 | $ 12,500 | $ 25,500 | $ 12,800 | $ 13,100 | $ 29,700 | $ 80,990 | $ 81,133 |  | $ 141,582
Additional information unconsolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale of interest in joint venture |  |  |  |  |  |  |  |  |  |  | $ 52,000 |
Equity interest (in percent) |  |  |  |  |  |  |  | 50.00% |  |  | 50.00% |
Unconsolidated Joint Ventures | Pass through joint ventures |  |  |  |  |  |  |  |  |  |  |  |
Financial Information |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 31,600 | 34,100 |  | 36,600
Unconsolidated Joint Ventures | Other joint ventures |  |  |  |  |  |  |  |  |  |  |  |
Financial Information |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | $ 49,400 | $ 47,000 |  | $ 105,000

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