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Investments in and advances to unconsolidated joint ventures - Additional Disclosures (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) investment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 investment
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated joint ventures with ownership interests \| investment	10		10
Management Fee Revenue	$ 118,848	$ 123,231
Equity in net income of unconsolidated joint ventures	$ 184	335
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	5.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	35.00%
Management Service [Member]
Schedule of Equity Method Investments [Line Items]
Management Fee Revenue	$ 543	$ 980

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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