Employee Benefits - Change in Fair Value of Pension Plan Assets (Details) - Pension Benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 248,735	$ 199,466
Fair value of plan assets at end of year	283,940	248,735
U.S. property separate account fund
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	22,269
Fair value of plan assets at end of year	27,328	22,269
U.S. property separate account fund | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	22,269	22,114
Unrealized gains	5,059	155
Fair value of plan assets at end of year	$ 27,328	$ 22,269