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Summary of Significant Accounting Policies - Schedule Of Other Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Net Carrying Amount | $ 1,415,287 | $ 1,506,522
Other finite-lived intangible assets (included in Other, a component of Other assets, net) |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 19,842 | 20,310
Accumulated Amortization | (17,385) | (14,798)
Net Carrying Amount | $ 2,457 | $ 5,512

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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