Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	6,758	7,356	7,530
Expected return of plan assets	(8,662)	(9,221)	(10,808)
Amortization of prior service cost (credit)	0	0	0
Amortization of net loss	1,828	1,755	1,784
Settlement charge	0	0	0
Net periodic benefit cost (benefit)	(76)	(110)	(1,494)
Retirement Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	73	80	133
Interest cost	62	71	75
Expected return of plan assets	0	0	0
Amortization of prior service cost (credit)	(1,602)	(1,602)	(1,489)
Amortization of net loss	0	0	(47)
Settlement charge	0	0	0
Net periodic benefit cost (benefit)	$ (1,467)	$ (1,451)	$ (1,328)