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Employee Benefit Plans and Other Postretirement Benefits (Schedule Of Fair Value Of Pension Plan and Postretirement Healthcare Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Pension Plan Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | $ 2,162,885 | $ 1,899,889 |
Total assets in the fair value hierarchy excluding assets measured at net asset value | 2,148,684 | 1,877,945 |
Pension Plan Assets | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,368,474 | 1,127,105 |
Pension Plan Assets | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 780,210 | 750,840 |
Pension Plan Assets | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 51,082 | 84,548 |
Pension Plan Assets | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,057 | 1,284 |
Pension Plan Assets | Cash and cash equivalents | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 50,025 | 83,264 |
Pension Plan Assets | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,283,092 | 1,044,455 |
Pension Plan Assets | Equity Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,265,676 | 1,027,189 |
Pension Plan Assets | Equity Securities | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 17,416 | 17,266 |
Pension Plan Assets | U.S. companies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 722,527 | 603,568 |
Pension Plan Assets | U.S. companies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 705,111 | 586,302 |
Pension Plan Assets | U.S. companies | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 17,416 | 17,266 |
Pension Plan Assets | Foreign companies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 78,765 | 50,256 |
Pension Plan Assets | Foreign companies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 78,765 | 50,256 |
Pension Plan Assets | Foreign companies | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Pension Plan Assets | Harley-Davidson common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 64,800 | 74,301 |
Pension Plan Assets | Harley-Davidson common stock | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 64,800 | 74,301 |
Pension Plan Assets | Harley-Davidson common stock | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Pension Plan Assets | Pooled equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 416,881 | 316,225 |
Pension Plan Assets | Pooled equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 416,881 | 316,225 |
Pension Plan Assets | Pooled equity funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Pension Plan Assets | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 119 | 105 |
Pension Plan Assets | Other | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 119 | 105 |
Pension Plan Assets | Other | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Pension Plan Assets | Fixed-income holdings |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 814,510 | 748,942 |
Pension Plan Assets | Fixed-income holdings | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 101,741 | 98,632 |
Pension Plan Assets | Fixed-income holdings | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 712,769 | 650,310 |
Pension Plan Assets | U.S. Treasuries |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 39,866 | 41,089 |
Pension Plan Assets | U.S. Treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 39,866 | 41,089 |
Pension Plan Assets | U.S. Treasuries | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Pension Plan Assets | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 29,188 | 36,210 |
Pension Plan Assets | Federal agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Pension Plan Assets | Federal agencies | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 29,188 | 36,210 |
Pension Plan Assets | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 462,563 | 418,522 |
Pension Plan Assets | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Pension Plan Assets | Corporate bonds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 462,563 | 418,522 |
Pension Plan Assets | Pooled fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 189,361 | 170,741 |
Pension Plan Assets | Pooled fixed income funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 61,875 | 57,543 |
Pension Plan Assets | Pooled fixed income funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 127,486 | 113,198 |
Pension Plan Assets | Foreign bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 81,732 | 69,871 |
Pension Plan Assets | Foreign bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Pension Plan Assets | Foreign bonds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 81,732 | 69,871 |
Pension Plan Assets | Municipal bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 11,800 | 12,509 |
Pension Plan Assets | Municipal bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Pension Plan Assets | Municipal bonds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 11,800 | 12,509 |
Pension Plan Assets | Limited partnership interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets measured at net asset value | 9,099 | 9,321 |
Pension Plan Assets | Real estate investment trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets measured at net asset value | 5,102 | 12,623 |
Postretirement Health Coverage |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 217,537 | 170,092 | $ 156,765
Total assets in the fair value hierarchy excluding assets measured at net asset value | 210,787 | 164,574 |
Postretirement Health Coverage | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 179,056 | 131,221 |
Postretirement Health Coverage | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 31,731 | 33,353 |
Postretirement Health Coverage | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 19,317 | 4,442 |
Postretirement Health Coverage | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 1,180 |
Postretirement Health Coverage | Cash and cash equivalents | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 19,317 | 3,262 |
Postretirement Health Coverage | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 144,795 | 117,974 |
Postretirement Health Coverage | Equity Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 144,792 | 117,779 |
Postretirement Health Coverage | Equity Securities | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 3 | 195 |
Postretirement Health Coverage | U.S. companies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 101,720 | 84,643 |
Postretirement Health Coverage | U.S. companies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 101,720 | 84,643 |
Postretirement Health Coverage | U.S. companies | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Postretirement Health Coverage | Foreign companies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 19,498 | 14,190 |
Postretirement Health Coverage | Foreign companies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 19,495 | 13,995 |
Postretirement Health Coverage | Foreign companies | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 3 | 195 |
Postretirement Health Coverage | Pooled equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 23,563 | 19,132 |
Postretirement Health Coverage | Pooled equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 23,563 | 19,132 |
Postretirement Health Coverage | Pooled equity funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Postretirement Health Coverage | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 14 | 9 |
Postretirement Health Coverage | Other | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 14 | 9 |
Postretirement Health Coverage | Other | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Postretirement Health Coverage | Fixed-income holdings |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 46,675 | 42,158 |
Postretirement Health Coverage | Fixed-income holdings | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 34,264 | 12,262 |
Postretirement Health Coverage | Fixed-income holdings | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 12,411 | 29,896 |
Postretirement Health Coverage | U.S. Treasuries |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 6,803 | 12,262 |
Postretirement Health Coverage | U.S. Treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 6,803 | 12,262 |
Postretirement Health Coverage | U.S. Treasuries | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Postretirement Health Coverage | Federal agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 5,060 | 7,364 |
Postretirement Health Coverage | Federal agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Postretirement Health Coverage | Federal agencies | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 5,060 | 7,364 |
Postretirement Health Coverage | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 6,756 | 11,750 |
Postretirement Health Coverage | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Postretirement Health Coverage | Corporate bonds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 6,756 | 11,750 |
Postretirement Health Coverage | Pooled fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 27,461 | 9,690 |
Postretirement Health Coverage | Pooled fixed income funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 27,461 | 0 |
Postretirement Health Coverage | Pooled fixed income funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 9,690 |
Postretirement Health Coverage | Foreign bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 311 | 633 |
Postretirement Health Coverage | Foreign bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Postretirement Health Coverage | Foreign bonds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 311 | 633 |
Postretirement Health Coverage | Municipal bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 284 | 459 |
Postretirement Health Coverage | Municipal bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0 | 0 |
Postretirement Health Coverage | Municipal bonds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 284 | 459 |
Postretirement Health Coverage | Real estate investment trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets measured at net asset value | $ 6,750 | $ 5,518 |

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