Employee Retirement and Profit Sharing Plans - Fair Values by Category of Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 299,208	$ 344,760
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	$ 299	364
Equity Securities Index Funds U S Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	84,693	98,759
Equity Securities Index Funds Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	5,924	7,675
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	90,916	106,798
Fixed Income, Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	203,640	233,628
Fixed Income Diversified Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	2,712	2,700
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	206,352	236,328
Short-term Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,940	1,634
Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,940	1,634
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	299	364
Level 1 | Equity Securities, Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	299	364
Level 1 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	299	364
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	296,197	341,696
Level 2 | Equity Securities Index Funds U S Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	84,693	98,759
Level 2 | Equity Securities Index Funds Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	5,924	7,675
Level 2 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	90,617	106,434
Level 2 | Fixed Income, Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	203,640	233,628
Level 2 | Fixed Income Diversified Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0
Level 2 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	203,640	233,628
Level 2 | Short-term Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,940	1,634
Level 2 | Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,940	1,634
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	2,712	2,700	$ 4,093
Level 3 | Fixed Income Diversified Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	2,712	2,700	$ 3,930
Level 3 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 2,712	$ 2,700