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Bank and Other Notes Payable (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 29, 2013 | Sep. 30, 2018 | Dec. 31, 2017
Mortgage loans payable on real estate |  |  |
Unamortized deferred finance costs |  | $ 14,232,000 | $ 17,838,000
Availability for additional borrowing |  | 709,720,000 | 504,412,000
Swap | Level 2 measurement |  |  |
Mortgage loans payable on real estate |  |  |
Outstanding borrowings under the line of credit |  | 400,000,000 |
Line of Credit |  |  |
Mortgage loans payable on real estate |  |  |
Outstanding borrowings under the line of credit |  | 790,000,000 | 935,000,000
Unamortized deferred finance costs |  | $ 5,781,000 | $ 7,548,000
Line of credit, average interest rate |  | 4.08% | 3.13%
Line of Credit | Level 2 measurement |  |  |
Mortgage loans payable on real estate |  |  |
Fair value of outstanding line of credit |  | $ 791,233,000 | $ 919,158,000
Prasada Note |  |  |
Mortgage loans payable on real estate |  |  |
Amount of additional borrowing | $ 13,330,000 |  |
Interest rate on debt | 5.25% |  |
Debt, carrying value |  | 3,903,000 | 4,732,000
Debt, fair value |  | $ 3,900,000 | $ 4,717,000
LIBOR | Line of Credit |  |  |
Mortgage loans payable on real estate |  |  |
Interest rate spread over basis |  | 1.45% |
Revolving line of credit |  |  |
Mortgage loans payable on real estate |  |  |
Revolving line of credit |  | $ 1,500,000,000 |
Extension option (years) |  | 1 year |
Maximum contingent borrowing capacity |  | $ 2,000,000,000 |
Revolving line of credit | Swap |  |  |
Mortgage loans payable on real estate |  |  |
Effective interest rate |  | 4.30% |
Revolving line of credit | LIBOR | Low end of range |  |  |
Mortgage loans payable on real estate |  |  |
Interest rate spread over basis |  | 1.30% |
Revolving line of credit | LIBOR | High end of range |  |  |
Mortgage loans payable on real estate |  |  |
Interest rate spread over basis |  | 1.90% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)(1) -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(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 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 4: 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 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&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://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 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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