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Fair Values - Schedule of Fair Value Measurement (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) land_asset | Sep. 30, 2020 USD ($)
Assets and liabilities recorded at fair value |  |
Derivative liabilities | $ 8,700 | $ 20,800
Other investments | 907,875 | 1,123,093
Recurring Basis | Fair Value |  |
Assets and liabilities recorded at fair value |  |
Derivative assets | 114 |
Derivative liabilities | 8,680 | 20,818
Available-for-sale securities | 23,896 | 24,631
Recurring Basis | Quoted market prices in active markets (Level 1) |  |
Assets and liabilities recorded at fair value |  |
Derivative assets | 0 |
Derivative liabilities | 0 | 0
Available-for-sale securities | 0 | 0
Recurring Basis | Significant other observable inputs (Level 2) |  |
Assets and liabilities recorded at fair value |  |
Derivative assets | 114 |
Derivative liabilities | 8,680 | 20,818
Available-for-sale securities | 0 | 0
Recurring Basis | Significant unobservable inputs (Level 3) |  |
Assets and liabilities recorded at fair value |  |
Derivative assets | 0 |
Derivative liabilities | 0 | 0
Available-for-sale securities | 23,896 | 24,631
Non-recurring Basis |  |
Assets and liabilities recorded at fair value |  |
Aggregate impairments | $ 5,300 |
Number of land and development assets impaired | land_asset | 2 |
Non-recurring Basis | Fair Value |  |
Assets and liabilities recorded at fair value |  |
Other investments |  | 62,961
Impaired land and development | $ 40,000 |
Non-recurring Basis | Quoted market prices in active markets (Level 1) |  |
Assets and liabilities recorded at fair value |  |
Other investments |  | 0
Impaired land and development | 0 |
Non-recurring Basis | Significant other observable inputs (Level 2) |  |
Assets and liabilities recorded at fair value |  |
Other investments |  | 62,961
Impaired land and development | 0 |
Non-recurring Basis | Significant unobservable inputs (Level 3) |  |
Assets and liabilities recorded at fair value |  |
Other investments |  | $ 0
Impaired land and development | $ 40,000 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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