Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2016

Retirement Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

The net periodic benefit cost recognized for the three, nine and twelve months endedSeptember 30, 2016 and 2015 is made up of the components listed below as determined using the projected unit credit actuarial cost method (in thousands):

	Three Months Ended						Nine Months Ended						Twelve Months Ended
	September 30,						September 30,						September 30,
	2016			2015			2016			2015			2016			2015
Components of net periodic benefit cost:
Service cost	$	2,191		$	2,394		$	6,001		$	6,594		$	8,199		$	8,707
Interest cost	3,250			3,622			9,780			10,872			13,403			14,563
Expected return on plan assets	(4,734		)	(4,951		)	(14,159		)	(14,846		)	(19,108		)	(19,528		)
Amortization of:
Net loss	1,730			2,485			5,505			7,985			8,167			10,267
Prior service benefit	(875		)	(855		)	(2,630		)	(2,630		)	(3,506		)	(3,506		)
Net periodic benefit cost	$	1,562		$	2,695		$	4,497		$	7,975		$	7,155		$	10,503

Other Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

The net periodic benefit cost recognized for the three, nine and twelve months endedSeptember 30, 2016 and 2015 is made up of the components listed below (in thousands):

	Three Months Ended						Nine Months Ended						Twelve Months Ended
	September 30,						September 30,						September 30,
	2016			2015			2016			2015			2016			2015
Components of net periodic benefit cost:
Service cost	$	749		$	841		$	2,179		$	2,591		$	3,042		$	3,302
Interest cost	871			976			2,616			3,026			3,625			4,142
Expected return on plan assets	(452		)	(503		)	(1,372		)	(1,553		)	(1,889		)	(2,082		)
Amortization of:
Prior service benefit	(788		)	(751		)	(2,363		)	(2,301		)	(3,130		)	(3,490		)
Net gain	(643		)	(519		)	(1,973		)	(1,519		)	(2,479		)	(2,186		)
Net periodic benefit cost (benefit)	$	(263	)	$	44		$	(913	)	$	244		$	(831	)	$	(314	)