Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 1,795,434	$ 1,980,507
Product
Disaggregation of Revenue [Line Items]
Net sales	1,649,268	1,803,538
Fluid milk
Disaggregation of Revenue [Line Items]
Net sales	1,134,896	1,259,934
Ice cream
Disaggregation of Revenue [Line Items]
Net sales	225,200	239,598
Fresh cream
Disaggregation of Revenue [Line Items]
Net sales	96,375	91,950
Extended shelf life and other dairy products
Disaggregation of Revenue [Line Items]
Net sales	43,584	45,242
Cultured
Disaggregation of Revenue [Line Items]
Net sales	61,907	64,166
Other beverages
Disaggregation of Revenue [Line Items]
Net sales	68,410	70,344
Other
Disaggregation of Revenue [Line Items]
Net sales	18,896	32,304
Branded products
Disaggregation of Revenue [Line Items]
Net sales	851,496	892,126
Private label products
Disaggregation of Revenue [Line Items]
Net sales	797,772	911,412
Sales of excess raw materials
Disaggregation of Revenue [Line Items]
Net sales	118,393	151,802
Sales of other bulk commodities
Disaggregation of Revenue [Line Items]
Net sales	$ 27,773	$ 25,167