Pension and Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlement Charge			$ (22,700)
Pension Premium Refund	$ 1,600		$ 1,600
Defined Benefit Plan Description Of Nature Of Event Resulting In Special Or Contractual Termination Benefits Recognized During Period			In the fourth quarter of 2018, the Company began the process of terminating its Legacy Quaker non-contributory U.S. pension plan (“Legacy Quaker U.S. Pension Plan”). During the third quarter of 2019, the Company received a favorable termination determination letter from the Internal Revenue Service (“I.R.S.”) and amended the Legacy Quaker U.S. Pension Plan to comply with final regulations of the Internal Revenue Code. The Company completed the Legacy Quaker U.S. Pension Plan termination during the first quarter of 2020. In order to terminate the Legacy Quaker U.S. Pension Plan in accordance with I.R.S. and Pension Benefit Guaranty Corporation requirements, the Company was required to fully fund the Legacy Quaker U.S. Pension Plan on a termination basis and the amount necessary to do so was approximately $1.8 million, subject to final true up adjustments. In the third quarter of 2020, the Company finalized the amount of the liability and related annuity payments and received a refund in premium of approximately $1.6 million. In addition, the Company recorded a non-cash pension settlement charge at plan termination of approximately $22.7 million. This settlement charge included the immediate recognition into expense of the related unrecognized losses within accumulated other comprehensive income (loss) (“AOCI”) on the balance sheet as of the plan termination date.
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1,227	$ 993	$ 3,565	$ 2,956
Defined Benefit Plan, Interest Cost	1,527	1,852	4,782	4,068
Defined Benefit Plan, Expected Return on Plan Assets	(3,526)	(2,140)	(7,246)	(4,102)
Defined Benefit Plan, Settlement Charge	0	0	22,667	0
Defined Benefit Plan, Amortization of Losses	626	799	2,288	2,348
Defined Benefit Plan, Amortization of Prior Service Cost	(42)	(34)	(123)	(117)
Defined Benefit Plan, Net Periodic Benefit Cost	(188)	1,470	25,933	5,153
Defined Benefit Plan, Expected Contributions In Current Fiscal Year	10,000		10,000
Defined Benefit Plan, Contributions by Employer			6,900
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	2	2	5	5
Defined Benefit Plan, Interest Cost	25	36	77	107
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0	0
Defined Benefit Plan, Settlement Charge	0	0	0	0
Defined Benefit Plan, Amortization of Losses	15	0	46	0
Defined Benefit Plan, Amortization of Prior Service Cost	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	42	$ 38	128	$ 112
Defined Benefit Plan, Expected Contributions In Current Fiscal Year	$ 400		400
Defined Benefit Plan, Contributions by Employer			200
Defined benefit plan settlement [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer			$ 1,800