Provision (Benefit) for Income Taxes Textuals (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Foreign income (loss) in Income from continuing operations before income taxes	$ (1,000)	$ (6,000)	$ (3,000)
Proceeds from Income Tax Refunds	40,000	86,000
Income Taxes Paid, Net			11,000
Unrecognized tax benefits	51,000
Unrecognized Tax Benefits, Period Increase (Decrease)	0	0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	51,000	51,000
Total interest and penalties recognized as part of income tax provision	900	500	$ 800
Total interest and penalties accrued as uncertain tax positions	4,000	$ 3,000
Internal Revenue Service (IRS) [Member] | Expiration None [Member]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	$ 905,000