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Joint Ventures - Unconsolidated JV - Sea Sound Apartments JV (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Investments
Net income		$ 45,480	$ 26,661	$ 31,602
Outstanding debt		161,418	94,507
Summarized financial information
Investment in real estate		551,653	430,776
Cash and cash equivalents		106,794	185,716	195,155
Total assets		1,037,324	909,233
Debt, net		158,915	92,529
Other liabilities		72,035	57,200
Equity		568,170	529,670	$ 533,111	$ 592,584
Total liabilities and equity		1,037,324	909,233
Sea Sound Apartments JV
Investments
Value of land contributed	$ 5,100
Mitigation bank credits contributed		400
Cash contributed		4,900
Net income		$ 0
Ownership percentage		60.00%
Unconsolidated joint ventures
Investments
Outstanding debt		$ 33,088	$ 8,242
Sea Sound Apartments JV
Investments
Cash contributed by JV partner		6,900
Outstanding debt		8,789
Summarized financial information
Investment in real estate		29,085
Cash and cash equivalents		15
Total assets		29,100
Debt, net		8,378
Other liabilities		3,439
Equity		17,283
Total liabilities and equity		29,100
Sea Sound Apartments JV \| Sea Sound Apartments JV Loan
Investments
Loan amount	$ 40,300
Outstanding debt		$ 8,800
Sea Sound Apartments JV \| LIBOR \| Sea Sound Apartments JV Loan
Investments
Basis spread on variable rate	2.15%
Sea Sound Apartments JV \| Apartment
Investments
Number of units to be developed \| item		300