Pension and Postretirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Benefits [Member]
Net Periodic Benefit Costs [Abstract]
Service cost	$ 26	$ 26	$ 52	$ 52
Interest cost	130	142	260	284
Expected return on plan assets	(161)	(253)	(323)	(507)
Amortization of losses (gains)	36	60	73	120
Curtailment loss	0	306	0	306
Net periodic benefit expense (income)	31	281	62	255
Post-Retirement Benefits [Member]
Net Periodic Benefit Costs [Abstract]
Service cost	0	0	0	0
Interest cost	25	29	51	58
Expected return on plan assets	0	0	0	0
Amortization of losses (gains)	(41)	(20)	(83)	(40)
Curtailment loss	0	0	0	0
Net periodic benefit expense (income)	(16)	9	(32)	$ 18
Turning Point [Member] | Pension Benefits [Member]
Pension and Postretirement Benefit Plans [Abstract]
Expected contributions in 2019	0		0
Net Periodic Benefit Costs [Abstract]
Curtailment loss		$ 300
Turning Point [Member] | Post-Retirement Benefits [Member]
Pension and Postretirement Benefit Plans [Abstract]
Expected contributions in 2019	$ 200		$ 200