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Share-Based Compensation - Deferred Compensation Plan (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
SERP expense | $ 8,827 | $ 7,872 | $ 6,865
SERP |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
SERP expense | $ 531 | $ 512 | $ 539
Treasury shares issued to fund SERP expense (in shares) | 30 | 18 | 22
SERP trust account balance at December 31 | $ 59,086 | $ 54,729 | $ 43,952
Unrealized gain recorded in SERP liability account | $ 6,676 | $ 9,200 | $ 7,353

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- Definition Deferred Compensation Unrealized Gain (Loss) Recorded Within The Deferred Compensation Liability Account + References No definition available. + Details
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