Income Taxes (Schedule of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Net operating loss carryforwards	$ 34,294	$ 36,875
Foreign tax credit carryforwards	126,007	126,007
Compensation and benefits	961	953
Indemnification liabilities	66	216
Other, net	305	219
Federal benefit of uncertain tax positions	428	98
Pension costs	3,375	3,157
Investments in and advances to affiliates	992	1,360
Total deferred tax assets before valuation allowance	166,428	168,885
Less valuation allowance	(128,483)	(128,365)
Deferred tax assets	$ 37,945	$ 40,520