Income Taxes (Schedule of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Abstract]
Net operating loss carryforwards	$ 23,020	$ 34,294
Foreign tax credit carryforwards	126,007	126,007
Compensation and benefits	701	961
Indemnification liabilities	98	66
Other, net	279	305
Federal benefit of uncertain tax positions	701	428
Pension costs	4,119	3,375
Investments in and advances to affiliates	828	992
Total deferred tax assets before valuation allowance	155,753	166,428
Less valuation allowance	(128,414)	(128,483)
Deferred tax assets	$ 27,339	$ 37,945