Employee Retirement and Profit Sharing Plans - Fair Values by Category of Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 341,084	$ 299,208
U.S. large-cap stocks (as a percent)	90.00%
International stocks (as a percent)	10.00%
Equity Securities, Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 426	299
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	107,889	90,916
Equity Securities Index Funds U S Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	100,762	84,693
Equity Securities Index Funds Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	6,701	5,924
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	231,272	206,352
Fixed Income, Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	228,652	203,640
Fixed Income Diversified Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	2,620	2,712
Short-term Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,923	1,940
Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,923	1,940
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	426	299
Level 1 | Equity Securities, Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	426	299
Level 1 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	426	299
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	338,038	296,197
Level 2 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	107,463	90,617
Level 2 | Equity Securities Index Funds U S Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	100,762	84,693
Level 2 | Equity Securities Index Funds Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	6,701	5,924
Level 2 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	228,652	203,640
Level 2 | Fixed Income, Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	228,652	203,640
Level 2 | Fixed Income Diversified Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0
Level 2 | Short-term Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,923	1,940
Level 2 | Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,923	1,940
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	2,620	2,712	$ 2,700
Level 3 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	2,620	2,712
Level 3 | Fixed Income Diversified Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 2,620	$ 2,712	$ 2,700