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Notes Payable and Amounts Due Under Repurchase Agreements (2027 Notes Narrative) (Details) - June 2027 Notes - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Jun. 16, 2017
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Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 500,000 | $ 500,000 | $ 500,000
Interest rate |  |  | 5.00%
Unamortized discount | $ 254 | $ 277 | $ 300
Debt financing costs |  |  | $ 5,800

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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 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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