Derivative Financial Instruments and Fair Value Measurements - Carrying Value and Fair Value of Senior Notes and Subsidiary Senior Notes (Details) - Dean Foods Company - Senior Notes Due 2023 - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Senior Notes, Amount Outstanding	$ 700,000	$ 700,000
Senior Notes
Debt Instrument [Line Items]
Senior Notes, Fair Value	$ 560,000	$ 698,250