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Pension and Other Postretirement Benefit Plans - Summary of Obligations Recognized in Other Comprehensive Income (Details) - Pension Benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]
Net actuarial loss	$ 15,225	$ 11,196	$ 25,595
Pension settlement	(18,071)	0	0
Amortization of actuarial loss	(8,611)	(6,516)	(7,362)
Amortization of prior service credit	1,432	1,432	1,432
Total (income) loss recognized in other comprehensive income (loss)	(10,025)	6,112	19,665
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 14,491	$ 11,010	$ 23,895

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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