Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Schedule of components of net periodic pension expense

Net periodic pension expense for the company’s defined benefit pension plans includes the following components:

	Location in Condensed	Three Months Ended March 31,
(in thousands)	Consolidated Statement of Earnings	2019			2018
Service cost	Total cost of revenue	$	3,981		$	4,671
Interest cost	Corporate general and administrative expense	4,975			5,867
Expected return on assets	Corporate general and administrative expense	(8,279		)	(10,256		)
Amortization of prior service credit	Corporate general and administrative expense	(225		)	(243		)
Recognized net actuarial loss	Corporate general and administrative expense	2,619			1,911
Net periodic pension expense		$	3,071		$	1,950