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Mortgage Loans on Real Estate (Schedule of Financing Receivables Past Due) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Commercial mortgage loans, past due | $ 0 | $ 0
Commercial mortgage loans, current | 3,092,558 | 2,952,464
Commercial mortgage loans, collateral dependent receivables | 0 | 0
Principal outstanding | 3,092,558 | 2,952,464
30 to 59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Commercial mortgage loans, past due | 0 | 0
60 to 89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Commercial mortgage loans, past due | 0 | 0
90 Days and Over |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Commercial mortgage loans, past due | $ 0 | $ 0

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- Definition Mortgage loans on real estate at the reporting date that are not performing and will probably be satisfied by taking ownership of the real estate serving as collateral. + References No definition available. + Details
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- Definition Financing receivables that are current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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