Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Schedule of components of net periodic benefit cost (income)

Components of net periodic benefit cost (income) were as follows: 

	Pension Benefits						Postretirement Benefits
	Three months ended September 30,
(in thousands)	2019			2018			2019			2018
Components of net periodic benefit cost (income)
Service cost	$	2,262		$	2,217		$	143		$	164
Interest cost	2,644			2,950			140			123
Expected return on plan assets	(3,123		)	(3,006		)	—			—
Settlement expense	2,122			4,611			—			—
Curtailment income	—			(40		)	—			—
Amortization of net loss (gain)	513			329			(359		)	(385		)
Amortization of prior service cost (credit)	94			44			(35		)	(35		)
Net periodic benefit cost (income)	$	4,512		$	7,105		$	(111	)	$	(133	)

	Pension Benefits						Postretirement Benefits
	Nine months ended September 30,
(in thousands)	2019			2018			2019			2018
Components of net periodic benefit cost (income)
Service cost	$	6,384		$	6,919		$	430		$	493
Interest cost	8,432			8,897			418			368
Expected return on plan assets	(9,679		)	(9,483		)	—			—
Settlement expense	3,897			5,083			—			—
Curtailment income	—			(40		)	—			—
Amortization of net loss (gain)	914			1,581			(1,077		)	(1,155		)
Amortization of prior service cost (credit)	186			131			(103		)	(103		)
Net periodic benefit cost (income)	$	10,134		$	13,088		$	(332	)	$	(397	)