Employees Pension and Postretirement Benefits (Tables) - SERP Benefits [Member]

9 Months Ended

Sep. 30, 2019

Defined Benefit Plan Disclosure [Line Items]

Amounts Accrued

	September 30,		December 31,
	2019		2018
Projected benefit obligation:
Obligation, beginning of period	$	17,977	$	19,003
Interest cost		423		422
Actuarial gain		—		(1,448	)
Obligation, end of period and unfunded status	$	18,400	$	17,977

Pension Expense

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Interest cost	$	141	$	105	$	423	$	316