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Shareholders' Equity Other Comprehensive Income Rollforward - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (334,925) | $ (323,673) | $ (302,414) | $ (265,406)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | (35,755) | (32,269) | (24,106) |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (11,323) | (1,063) | (658) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 10,213 | 790 | (29,051) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (11,066) | 861 | (2,441) |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 25,613 | 11,283 | 16,807 |
Other Comprehensive Income (Loss), Net of Tax | (11,252) | (21,259) | (37,008) |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (31,101) | (61,015) | (63,913) | (31,340)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | 0 | 0 | 0 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | 0 | 0 | 0 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 29,914 | 2,898 | (32,573) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax | 0 | 0 | 0 |
Other Comprehensive Income (Loss), Net of Tax | 29,914 | 2,898 | (32,573) |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (1,479) | (1,222) | 702 | (1,081)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | 0 | 0 | 0 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (11,323) | (1,063) | (658) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 0 | 0 | 0 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 11,066 | (861) | 2,441 |
Other Comprehensive Income (Loss), Net of Tax | (257) | (1,924) | 1,783 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (302,345) | (261,436) | (239,203) | $ (232,985)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | (35,755) | (32,269) | (24,106) |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | 0 | 0 | 0 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | (19,701) | (2,108) | 3,522 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 14,547 | 12,144 | 14,366 |
Other Comprehensive Income (Loss), Net of Tax | $ (40,909) | $ (22,233) | $ (6,218) |

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