Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Compensation and employee benefits		$ 300
Tax credit carryforwards	21,400	22,200
Net operating loss carryforwards	144,100	147,300
Accrued liabilities and other reserves		200
Pension	3,400	4,200
Intangible assets, net		2,500
Capital losses	26,900	9,500
Other, net	40,600	44,400
Total deferred tax assets	236,400	230,600
Valuation allowance	(236,400)	(230,600)
Net deferred tax assets
Unremitted earnings of foreign subsidiaries	(200)	(500)
Total deferred tax liabilities	(200)	(500)
Valuation allowance
Total deferred tax liabilities	(200)	(500)
Net deferred tax liabilities	$ (200)	$ (500)