Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2019

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 September 30,	2019			2018			2019			2018
Net periodic benefit cost
Service cost	$	1,997		$	2,175		$	456		$	750
Interest cost	2,080			1,875			319			502
Expected return on plan assets	(2,696		)	(2,626		)	—			—
Amortization of prior service credit	—			—			(2,221		)	(1,352		)
Amortization of net loss	901			1,072			224			589
Net periodic benefit cost	$	2,282		$	2,496		$	(1,222	)	$	489

	Pension Plan						Postretirement Benefit Plan
Nine Months Ended September 30,	2019			2018			2019			2018
Net periodic benefit cost
Service cost	$	5,991		$	6,525		$	1,368		$	2,249
Interest cost	6,240			5,625			956			1,506
Expected return on plan assets	(8,088		)	(7,877		)	—			—
Amortization of prior service credit	—			—			(6,463		)	(4,056		)
Amortization of net loss	2,703			3,215			671			1,767
Net periodic benefit cost	$	6,846		$	7,488		$	(3,468	)	$	1,466