Share-Based Compensation - Deferred Compensation Plan (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	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