Income Taxes (Schedule of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Net operating loss carryforwards	$ 36,875	$ 43,557
Foreign tax credit carryforwards	126,007	121,360
Compensation and benefits	953	943
Indemnification liabilities	216	216
Other, net	219	454
Federal benefit of uncertain tax positions	98	1,518
Pension costs	3,157	3,458
Investments in and advances to affiliates	1,360	2,546
Total deferred tax assets before valuation allowance	168,885	174,052
Less valuation allowance	(128,365)	(124,036)
Deferred tax assets net of valuation allowance	$ 40,520	$ 50,016