Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details 2) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Notes Payable, Unsecured Notes and Credit Facility
Credit Facility	$ 0	$ 0
Net carrying value of apartment communities and improved land parcels securing debt	1,816,856,000
Variable Rate Unsecured Term Loan $250 Million [Member] \| Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Debt Instrument, Face Amount	250,000,000
Variable Rate Unsecured Term Loan $100 Million \| Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Debt Instrument, Face Amount	$ 100,000,000
Variable Rate Unsecured Term Loan $100 Million \| LIBOR \| Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	0.90%
Variable Rate Unsecured Term Loan $150 Million \| Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Debt Instrument, Face Amount	$ 150,000,000
Variable Rate Unsecured Term Loan $150 Million \| LIBOR \| Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	0.85%
Line of Credit [Member]
Notes Payable, Unsecured Notes and Credit Facility
Percent of Credit Facility Available to Competitive Bid Option	65.00%
Available borrowing capacity	$ 1,750,000,000	1,500,000,000
Annual facility fee, percentage	0.125%
Annual facility fee	$ 2,188,000
Credit Facility	0	0
Outstanding balance of letters of credit	$ 39,055,000	$ 39,810,000
Line of Credit [Member] \| LIBOR
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	0.775%	0.825%
Current interest rate (as a percent)	3.27%
Fixed Rate Mortgage Notes Payable [Member]
Notes Payable, Unsecured Notes and Credit Facility
Weighted average interest rate, debt (as a percent)	3.80%	3.80%
Variable Rate Mortgage Notes Payable Unsecured Term Loan and Credit Facility [Member]
Notes Payable, Unsecured Notes and Credit Facility
Weighted average interest rate, debt (as a percent)	3.20%	3.40%
Minimum \| Variable Rate Unsecured Term Loan $150 Million \| LIBOR \| Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	0.85%
Minimum \| Line of Credit [Member] \| LIBOR
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	0.70%	0.80%
Maximum \| Variable Rate Unsecured Term Loan $150 Million \| LIBOR \| Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	1.50%
Maximum \| Line of Credit [Member] \| LIBOR
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	1.45%	1.55%

Percent of Credit Facility Available to Competitive Bid Option

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

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

+ References

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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