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Shareholders' Equity Amounts recognized from accumulated other comprehensive income - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stockholders' Equity Note [Abstract] |  |  |
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | $ 2,413 | $ 109 | $ 539
Cross Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 11,531 | (1,022) | 2,212
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (13,944) | 913 | (2,751)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 2,878 | (52) | 310
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 11,066 | (861) | 2,441
Amortization of actuarial (gains) losses and plan amendments and prior service cost | 18,609 | 15,467 | 18,756
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent | 4,062 | 3,323 | 4,390
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | $ 14,547 | $ 12,144 | $ 14,366

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