Pension and Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlement Charge			$ (22,700)
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 8,000		$ 8,000
Defined benefit plan description of nature of event resulting in contractual termination benefits to be recognized in future 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 July 2020, the Company finalized the amount of the liability and related annuity payments and expects to receive a refund in premium of approximately $2 million in August 2020. 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 (loss) income (“AOCI”) on the balance sheet as of the plan termination date.
Expected Pension Premium Refund			$ 2,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1,164	$ 978	2,338	$ 1,963
Defined Benefit Plan, Interest Cost	1,486	1,105	3,255	2,216
Defined Benefit Plan, Expected Return on Plan Assets	(1,761)	(978)	(3,720)	(1,962)
Defined Benefit Plan, Settlement Charge	0	0	22,667	0
Defined Benefit Plan, Amortization of Losses	615	773	1,662	1,549
Defined Benefit Plan, Amortization of Prior Service Cost	(41)	(41)	(81)	(83)
Defined Benefit Plan, Net Periodic Benefit Cost	1,463	1,837	26,121	3,683
Defined Benefit Plan, Expected Contributions In Current Fiscal Year	10,000		10,000
Defined Benefit Plan, Contributions by Employer			4,900
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1	2	3	4
Defined Benefit Plan, Interest Cost	26	36	52	71
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	16	0	31	0
Defined Benefit Plan, Amortization of Prior Service Cost	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	43	$ 38	86	$ 75
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