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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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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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