Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of periodic costs for employee retirement benefit plan

The following tables set forth information relating to the Company’s periodic costs for its employee retirement benefit plans:

	(In Thousands)
	Pension Benefits						Other Benefits
	Three Months Ended June 30,
	2018			2017			2018			2017
Service Cost	$	607		$	600		$	284		$	272
Interest Cost		765			786			474			491
Expected Return on Assets		(1,218	)		(1,122	)		(637	)		(601	)
Amortization of Unrecognized Losses		415			391			447			445
Amortization of Unrecognized Prior Service Cost (Credit)		—			—			(402	)		(432	)
Net Periodic Benefit Cost*	$	569		$	655		$	166		$	175

	Pension Benefits						Other Benefits
	Six Months Ended June 30,
	2018			2017			2018			2017
Service Cost	$	1,213		$	1,200		$	567		$	544
Interest Cost		1,530			1,572			949			982
Expected Return on Assets		(2,435	)		(2,245	)		(1,275	)		(1,203	)
Amortization of Unrecognized Losses		829			783			894			890
Amortization of Unrecognized Prior Service Cost (Credit)		—			—			(803	)		(864	)
Net Periodic Benefit Cost*	$	1,137		$	1,310		$	332		$	349
*Service cost is included in Operations and Maintenance expense on Consolidated Statements of Income; all other amounts are included in Other Income/Expense, net.