Investment in Unconsolidated Joint Ventures (EP I LLC and EP II LLC) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Combined gross sales price	$ 370,944	$ 622,643	$ 225,307
Distribution received	11,065	14,184	11,664
Gain recorded in income from unconsolidated joint ventures	$ 47,115	$ 10,562	$ 8,302
EP I, LLC and EP II, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	75.00%
Combined gross sales price	$ 199,000
Distribution received	70,000
Gain recorded in income from unconsolidated joint ventures	37,900
Cash balance of joint venture	$ 751
EP I, LLC and EP II, LLC \| Gables
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	25.00%

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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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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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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