Components of Net Periodic Benefit Cost (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

	Three Months Ended June 30,										Six Months Ended June 30,
	(000's)										(000's)
	Pension Benefits						Post-Retirement Health Benefits				Pension Benefits						Post-Retirement Health Benefits
	2015			2014			2015		2014		2015			2014			2015		2014
Service cost	$	538		$	510		$	16	$	13	$	1,076		$	1,020		$	32	$	26
Interest cost	879			939			43		44		1,758			1,878			87		88
Expected return on plan assets	(863		)	(948		)	—		—		(1,726		)	(1,896		)	—		—
Amortization of transition obligation	—			—			—		—		—			—			—		—
Net amortization of prior service cost	—			(2		)	—		—		—			(4		)	—		—
Net amortization of net (gain) loss	1,185			190			—		—		2,370			380			—		—
Net Periodic Benefit Cost	$	1,739		$	689		$	59	$	57	$	3,478		$	1,378		$	119	$	114