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Financial Instruments Financial Instruments narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value | $ 1,099,456 | $ 1,117,175
Debt securities gross unrealized gains | 100 |
Debt instrument fair value senior notes 2023 | 763,200 |
Debt instrument fair value senior notes 2025 | 537,200 |
Debt instrument fair value senior notes 2027 | $ 576,600 |

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Debt instrument fair value senior notes 2023 + References No definition available. + Details
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- Definition Debt instrument fair value senior notes 2025 + References No definition available. + Details
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- Definition Senior Notes 2027 + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant