BENEFIT PLANS (Tables)

6 Months Ended

Jun. 30, 2019

BENEFIT PLANS [Abstract]

Net Periodic Benefit Cost

The net periodic benefit cost for the three and six months ended June 30, 2019 and 2018 is as follows:

	Pension Benefits												Post-retirement Benefits
	Three Months Ended June 30,						Six Months Ended June 30,						Three Months Ended June 30,						Six Months Ended June 30,
(000's omitted)	2019			2018			2019			2018			2019			2018			2019			2018
Service cost	$	1,270		$	1,121		$	2,540		$	2,242		$	0		$	0		$	0		$	0
Interest cost		1,565			1,415			3,133			2,829			18			17			35			34
Expected return on plan assets		(3,578	)		(3,705	)		(7,155	)		(7,410	)		0			0			0			0
Amortization of unrecognized net loss		643			298			1,284			596			9			5			19			10
Amortization of prior service cost		16			(83	)		31			(165	)		(45	)		(44	)		(89	)		(89	)
Net periodic benefit	$	(84	)	$	(954	)	$	(167	)	$	(1,908	)	$	(18	)	$	(22	)	$	(35	)	$	(45	)