Employee Benefit Plans (Net Periodic Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during the period	$ 533	$ 587	$ 564
Interest cost on projected benefit obligation	4,860	4,495	5,059
Expected return on assets	(4,874)	(5,572)	(5,424)
Prior service cost	0	0	0
Amortization of net loss (gain)	2,001	1,804	2,009
Net expense	2,520	1,314	2,208
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during the period	3	4	5
Interest cost on projected benefit obligation	347	330	368
Expected return on assets	0	0	0
Prior service cost	4	4	0
Amortization of net loss (gain)	(40)	(41)	(54)
Net expense	$ 314	$ 297	$ 319