Employee Benefit Plans (Components of Net Period Benefit Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Components of the net periodic benefit cost
Service cost	$ 0	$ 0	$ 0
Interest cost	116	130	155
Expected return on plan assets	0	0	0
Recognized net actuarial loss	232	243	252
Benefit cost (income)	348	373	407
Postretirement Benefits
Components of the net periodic benefit cost
Service cost	365	319	391
Interest cost	854	752	985
Expected return on plan assets	911	910	455
Recognized net actuarial loss	0	0	0
Benefit cost (income)	$ 308	$ 161	$ 921