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Debt - Mortgage Notes Payable - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Mortgage notes payable	$ 1,962,471	$ 2,385,470
Debt instrument, maturity date	Jan. 10, 2022
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes payable	$ 4,900
Debt instrument, maturity date	May 28, 2061
Write off of deferred debt issuance cost	$ 2,300
Write off unamortized (premium) discount	$ 6,200
Weighted average interest rate	3.90%
Mortgages [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	0.10%
Mortgages [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.29%
Variable Rate Construction Mortgage [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jun. 25, 2022
Variable rate of construction mortgage debt	$ 7,600
Total commitment amount	67,600
Bonds [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 132,600
Debt instrument maturity year start	2032
Debt instrument maturity year, end	2036
Conventional Floating-rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 5,900
Debt instrument maturity year start	2032
Debt instrument maturity year, end	2035
Mortgages Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.79%
Repayments of long-term debt	$ 84,500
Debt instrument, maturity date	2053
Prepayment penalty charges	$ 3,400
Credit enhanced debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable	301,700
Fannie Mae Pool 3 [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 288,100
Debt instrument, maturity date	Mar. 01, 2029
Debt instrument, interest rate, stated percentage	3.94%
Freddie Mac Loan Pool [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jul. 01, 2020
Debt instrument, interest rate, stated percentage	5.78%
Repayments of long-term debt	$ 500,000

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Debt instrument maturity year.

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Debt instrument maturity year, start.

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Represents charges to interest expense related to the extinguishment of borrowing before maturity.

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Amount of write off of unamortized discount premium net.

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Weighted average interest rate of debt outstanding.

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Amount of the fee for available but unused credit capacity under the credit facility.

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The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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