Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2017

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures

The following tables provide the components of net periodic benefit costs for the three and nine-month periods ended September 30, 2017 and 2016.

				Select
	Employees'			Executive		Postretirement
	Pension			Retirement		Benefit
	Plan			Plan		Plans
Net Periodic Benefit Cost
For the Three Months Ended September 30, 2017:
Service Cost	$	350		$	10	$	37
Interest Cost	362			55		75
Expected Return on Plan Assets	(800		)	—		—
Amortization of Prior Service (Credit) Cost	(14		)	14		(3		)
Amortization of Net Loss	148			31		—
Net Periodic Benefit Cost	$	46		$	110	$	109
Plan Contributions During the Period	$	—		$	116	$	65
For the Three Months Ended September 30, 2016:
Service Cost	$	376		$	8	$	63
Interest Cost	420			56		83
Expected Return on Plan Assets	(828		)	—		—
Amortization of Prior Service (Credit) Cost	(14		)	14		(3		)
Amortization of Net Loss	140			28		—
Net Periodic Benefit Cost	$	94		$	106	$	143
Plan Contributions During the Period	$	—		$	131	$	47
Net Periodic Benefit Cost
For the Nine Months Ended September 30, 2017:
Service Cost	$	1,050		$	30	$	110
Interest Cost	1,085			164		224
Expected Return on Plan Assets	(2,399		)	—		—
Amortization of Prior Service Cost (Credit)	(43		)	43		(8		)
Amortization of Net Loss	443			94		—
Net Periodic Benefit Cost	$	136		$	331	$	326
Plan Contributions During the Period	$	—		$	345	$	295
Estimated Future Contributions in the Current Fiscal Year	$	—		$	115	$	98
For the Nine Months Ended September 30, 2016:
Service Cost	$	1,127		$	24	$	188
Interest Cost	1,262			163		178
Expected Return on Plan Assets	(2,483		)	—		—
Amortization of Prior Service (Credit) Cost	(42		)	43		(8		)
Amortization of Net Loss	419			84		—
Net Periodic Benefit Cost	$	283		$	314	$	358
Plan Contributions During the Period	$	—		$	350	$	197