Other Assets and Other Liabilities (Schedule of Other Liabilities) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) property	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Accounts Payable, Accrued Expenses and Other Liabilities
Accrued expenses	$ 87,734		$ 87,734		$ 101,035
Other liabilities	69,368		69,368		79,015
Accrued interest payable	50,359		50,359		49,933
Intangible liabilities, net	42,033		42,033		8,021
Accounts payable, accrued expenses and other liabilities	249,494		249,494		238,004
Developer fee payable	18,500		18,500		29,200
Special assessment bond	4,300		4,300		6,200
Below market lease, accumulated amortization	5,900		5,900		7,800
Amortization of below market lease	100	$ 800	300	$ 1,000
Real Estate Available and Held for Sale
Accounts Payable, Accrued Expenses and Other Liabilities
Accrued expenses	2,300		$ 2,300		2,500
Residential Real Estate | Master Planned Community
Accounts Payable, Accrued Expenses and Other Liabilities
Number of properties | property			2
Real Estate Assets Held-for-Sale
Accounts Payable, Accrued Expenses and Other Liabilities
Other liabilities	700		$ 700		$ 1,600
Net lease venture
Accounts Payable, Accrued Expenses and Other Liabilities
Intangible liabilities, net	$ 34,300		$ 34,300