Defined Benefit Retirement Plan (Narrative) (Details) - USD ($)	3 Months Ended			6 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2018	Dec. 31, 2017	Jun. 30, 2019	Dec. 31, 2007
Defined Benefit Plan Disclosure [Line Items]
Percentage of increase (decrease) in pension liability		9.00%	12.00%
Defined benefit plan, pre-tax settlement charge		$ 210,000	$ 377,000
Contribution to the defined benefit pension plan		$ 1,350,000
JVB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, pre-tax settlement charge	$ 278,000
Percentage of vested benefit					100.00%
Net actuarial gain (loss) recognized in other comprehensive income	(306,000)			$ (334,000)
Defined benefit plan, increase (decrease) in plan liability				(1,156,000)
Defined benefit plan overfunded amount	$ 782,000			$ 782,000