Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2020

Retirement Benefits [Abstract]

Net Periodic Benefit Cost

The components of the net periodic benefit cost for our pension and postretirement benefit plans are as follows:

	Pension Plan						Postretirement Benefit Plan
Three Months Ended March 31,	2020			2019			2020			2019
Net periodic benefit cost
Service cost	$	2,707		$	1,997		$	432		$	456
Interest cost	2,066			2,080			253			319
Expected return on plan assets	(3,385		)	(2,696		)	—			—
Amortization of prior service credit	—			—			(2,021		)	(2,021		)
Amortization of net loss	979			901			94			223
Net periodic benefit cost	$	2,367		$	2,282		$	(1,242	)	$	(1,023	)