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Share-Based Compensation - Summary of Information Of SERP (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
SERP expense | $ 6,865 | $ 5,900 | $ 5,985
SERP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
SERP expense | $ 539 | $ 547 | $ 503
Treasury shares issued to fund SERP expense (in shares) | 22 | 14 | 9
SERP trust account balance at December 31 | $ 43,952 | $ 39,766 | $ 42,467
Unrealized gain (loss) recorded in SERP liability account | $ 7,353 | $ (1,469) | $ 4,534

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