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Mortgage Notes Payable (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) property
Debt Instrument [Line Items] |  |
Mortgage notes payable | $ 1,806,626,000 | $ 2,008,417,000
Number of properties securing mortgage notes | property | 50 | 56
Weighted average interest rate (in hundredths) | 4.30% | 4.20%
Unamortized debt issuance expense | $ 4,200,000 | $ 5,400,000
Monthly interest expense | 7,600,000 |
Monthly principal amortization | 2,300,000 |
Mortgage notes payable, net | $ 1,806,626,000 | $ 2,008,417,000
Repayment of debt before the scheduled maturity date, prepayment penalties | The prepayment penalty on the majority of the Company’s mortgage notes payable are computed by the greater of (a) 1% of the amount of the principal being prepaid or (b) the present value of the principal being prepaid multiplied by the difference between the interest rate of the mortgage note and the stated yield rate on a U.S. treasury security which generally has an equivalent remaining term as the mortgage note. |
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Remaining terms | 1 year | 1 year
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Remaining terms | 28 years | 29 years
Fixed rate mortgage notes payable [Member] |  |
Debt Instrument [Line Items] |  |
Mortgage notes payable | $ 1,538,488,000 | $ 1,739,856,000
Prepayment penalty, percent of principal prepaid | 1.00% |
Variable rate mortgage notes payable [Member] |  |
Debt Instrument [Line Items] |  |
Mortgage notes payable | $ 268,138,000 | $ 268,561,000
Bond subject to interest rate caps | $ 256,000,000 |
Multifamily housing mortgage revenue bonds, variable interest rate (in hundredths) | 2.50% | 2.00%
Percentage of units subject to tenant income criteria (in hundredths) | 20.00% |
Variable rate mortgage notes payable [Member] | Total Return Swap [Member] |  |
Debt Instrument [Line Items] |  |
Bond subject to interest rate caps | $ 9,900,000 |
Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Mortgage notes payable | 1,795,895,000 |
Debt instrument, unamortized premium | 14,900,000 | $ 33,200,000
Secured Deeds of Trust [Member] |  |
Debt Instrument [Line Items] |  |
Mortgage notes payable, net | $ 0 | $ 0

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- Definition Represents payment remaining terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment in "PnYnMnD" format. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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