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Mortgages and Notes Payable - Credit Agreement Terms (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility borrowings |  | $ 160,000,000 |  | $ 0
Remaining borrowing capacity |  | 345,000,000 |  |
Debt issuance costs, net |  | 7,258,000 |  |
Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs, gross |  | 3,337,000 |  | $ 3,907,000
Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | 505,000,000 | $ 400,000,000 |
Revolving credit facility borrowings |  | $ 160,000,000 |  |
Unsecured Term Loan, Expiring August 2020 [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate stated percentage rate range minimum excluding LIBOR |  | 0.90% |  |
Unsecured Term Loan, Expiring August 2020 [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate stated percentage rate range minimum excluding LIBOR |  | 1.75% |  |
Unsecured Term Loan, Expiring August 2020 [Member] | Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 300,000,000 | 250,000,000 |
Unsecured Term Loan, Expiring February 2018 [Member] | Interest Rate Swap [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate |  | 1.09% |  |
Unsecured Term Loan, Expiring February 2018 [Member] | Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 250,000,000 |  |
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 | 255,000,000 |
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 August 2020 [Member] | Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate stated percentage rate range minimum excluding LIBOR |  | 1.10% |  |
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% |  |
LCIF [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Remaining borrowing capacity |  | $ 345,000,000 |  |
Weighted-average interest rate |  | 4.80% |  | 4.70%
Debt issuance costs, net |  | $ 1,511,000 |  |
LCIF [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% |  |  |
LCIF [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% |  |  |
LCIF [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | 505,000,000 | 400,000,000 |
LCIF [Member] | Unsecured Revolving Credit Facility, Expiring August 2019 [Member] | Unsecured Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility borrowings |  | $ 160,000,000 |  |
LCIF [Member] | Unsecured Term Loan, Expiring August 2020 [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate stated percentage rate range minimum excluding LIBOR |  | 0.90% |  |
LCIF [Member] | Unsecured Term Loan, Expiring August 2020 [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate stated percentage rate range minimum excluding LIBOR |  | 1.75% |  |
LCIF [Member] | Unsecured Term Loan, Expiring August 2020 [Member] | Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 300,000,000 | 250,000,000 |
LCIF [Member] | Unsecured Term Loan, Expiring February 2018 [Member] | Interest Rate Swap [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate |  | 1.09% |  |
LCIF [Member] | Unsecured Term Loan, Expiring February 2018 [Member] | Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 250,000,000 |  |
LCIF [Member] | Unsecured Term Loan, Expiring January 2021 [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate stated percentage rate range minimum excluding LIBOR |  | 0.90% |  |
LCIF [Member] | Unsecured Term Loan, Expiring January 2021 [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate stated percentage rate range minimum excluding LIBOR |  | 1.75% |  |
LCIF [Member] | Unsecured Term Loan, Expiring January 2021 [Member] | Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 300,000,000 | $ 255,000,000 |
LCIF [Member] | Unsecured Term Loan, Expiring January 2019 [Member] | Interest Rate Swap [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate |  | 1.42% |  |
LCIF [Member] | Unsecured Term Loan, Expiring January 2019 [Member] | Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 255,000,000 |  |
LCIF [Member] | 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% |  |
LCIF [Member] | London Interbank Offered Rate (LIBOR) [Member] | Unsecured Term Loan, Expiring August 2020 [Member] | Unsecured Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate stated percentage rate range minimum excluding LIBOR |  | 1.10% |  |
LCIF [Member] | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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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 No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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