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Goodwill and Other Intangible Assets - Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 9,742,648 |  | $ 9,378,174
Accumulated Amortization | (3,849,674) |  | (3,222,980)
Net Carrying Amount | 5,892,974 |  | 6,155,194
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 11,075,648 |  | 10,711,174
Net Carrying Amount | 7,225,974 | $ 7,487,536 | 7,488,194
Trade name |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,333,000 |  | 1,333,000
Customer-Related Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 7,924,412 |  | 7,568,456
Accumulated Amortization | (3,393,202) |  | (2,816,079)
Net Carrying Amount | 4,531,210 |  | 4,752,377
Dealer Relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,602,573 |  | 1,598,916
Accumulated Amortization | (273,420) |  | (230,511)
Net Carrying Amount | 1,329,153 |  | 1,368,405
Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 215,663 |  | 210,802
Accumulated Amortization | (183,052) |  | (176,390)
Net Carrying Amount | $ 32,611 |  | $ 34,412

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