Defined Benefit Retirement Plan (Components of Net Periodic Pension Cost) (Details) - JVB Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 125	$ 132	$ 250	$ 264
Expected return on plan assets	(124)	(192)	(248)	(384)
Recognized net actuarial loss	306	40	334	81
Net periodic pension cost (benefit)	307	(20)	336	(39)
Amortization of net actuarial loss recognized in other comprehensive income	(306)	(40)	(334)	(81)
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$ 1	$ (60)	$ 2	$ (120)