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Share-Based Compensation - Deferred Compensation Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
SERP expense | $ 7,872 | $ 6,865 | $ 5,900
SERP |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
SERP expense | $ 512 | $ 539 | $ 547
Treasury shares issued to fund SERP expense (in shares) | 18,000 | 22,000 | 14,000
SERP trust account balance at December 31 | $ 54,729 | $ 43,952 | $ 39,766
Unrealized gain (loss) recorded in SERP liability account | $ 9,200 | $ 7,353 | $ (1,469)

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