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Mortgages and Notes Payable - Credit Agreement Terms (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Remaining borrowing capacity | $ 505,000,000 |
Unsecured Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuance costs, gross | 1,267,000 | $ 1,804,000
Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 505,000,000 |
Unsecured Term Loan, Expiring January 2021 [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate stated percentage rate range minimum excluding LIBOR | 0.90% |
Unsecured Term Loan, Expiring January 2021 [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate stated percentage rate range minimum excluding LIBOR | 1.75% |
Unsecured Term Loan, Expiring January 2021 [Member] | Unsecured Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 300,000,000 |
Unsecured Term Loan, Expiring January 2019 [Member] | Interest Rate Swap [Member] |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate | 1.42% |
Unsecured Term Loan, Expiring January 2019 [Member] | Unsecured Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 255,000,000 |
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate stated percentage rate range minimum excluding LIBOR | 0.85% |
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate stated percentage rate range minimum excluding LIBOR | 1.55% |
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate stated percentage rate range minimum excluding LIBOR | 1.00% |
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Term Loan, Expiring January 2021 [Member] | Unsecured Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate stated percentage rate range minimum excluding LIBOR | 1.10% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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