Employee Retirement and Profit Sharing Plans - Reconciliation of Projected Benefit Obligation and Fair Value of Plans Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in plan assets:
Fair value of plan assets at beginning of year	$ 299,208
Fair value of plan assets at end of year	341,084	$ 299,208
Pension Plan
Change in benefit obligation:
Benefit obligation at beginning of year	314,098	349,784
Service cost	2,688	2,928	$ 3,007
Interest cost	12,335	11,311
Plan amendments	0	0
Actuarial (gain) loss	43,455	(26,820)
Benefits paid	(24,251)	(23,105)
Benefit obligation at end of year	348,325	314,098	349,784
Change in plan assets:
Fair value of plan assets at beginning of year	299,208	344,760
Actual return (loss) on plan assets	65,423	(23,276)
Employer contributions	704	829
Benefits paid	(24,251)	(23,105)
Fair value of plan assets at end of year	341,084	299,208	$ 344,760
Funded status at end of year	$ (7,241)	$ (14,890)