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Notes Payable - General Narrative (Details) - Notes Payable - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt |  |  |
Weighted average interest rate (as a percent) | 4.04% |  |
Weighted average remaining years until maturity | 8 years 8 months 12 days |  |
Interest incurred on notes and bonds | $ 213.8 | $ 197.1 | $ 171.5
Maximum |  |  |
Debt |  |  |
Debt to total adjusted assets ratio (as a percent) | 60.00% |  |
Secured debt to total adjusted assets ratio (as a percent) | 40.00% |  |
Minimum |  |  |
Debt |  |  |
Debt service coverage ratio | 1.5 |  |
Total unencumbered assets as a percentage of outstanding unsecured debt | 150.00% |  |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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