Pensions (Tables)

6 Months Ended

Jun. 30, 2018

Pensions [Abstract]

Components of Net Periodic Pension Cost

Components of Net Periodic Pension Cost

	Three Months Ended June 30						Six Months Ended June 30
	2018			2017			2018			2017
Service cost	$	254		$	270		$	508		$	540
Interest cost		379			398			758			796
Expected return on plan assets		(698	)		(598	)		(1,396	)		(1,197	)
Amortization of actuarial loss		102			123			203			246
Amortization of prior service cost		(4	)		(3	)		(7	)		(6	)
Rate-regulated adjustment		542			385			1,084			771
Net periodic pension expense	$	575		$	575		$	1,150		$	1,150