Pension and Postretirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Benefits [Member]
Plan Contributions [Abstract]
Expected contributions in 2019	$ 0			$ 0
Net Periodic Benefit Cost [Abstract]
Service cost	26	$ 26		78	$ 78
Interest cost	130	135		390	419
Expected return on plan assets	(161)	(221)		(484)	(728)
Amortization of (gains) losses	36	33		110	153
Curtailment loss			$ 300	0	306
Net periodic benefit (income) cost	31	(27)		94	228
Postretirement Benefits [Member]
Plan Contributions [Abstract]
Expected contributions in 2019	200			200
Net Periodic Benefit Cost [Abstract]
Service cost	0	0		0	0
Interest cost	25	30		76	88
Expected return on plan assets	0	0		0	0
Amortization of (gains) losses	(41)	(21)		(125)	(61)
Curtailment loss				0	0
Net periodic benefit (income) cost	$ (16)	$ 9		$ (49)	$ 27