Income Taxes Unrecognized Tax Benefits Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 1,640	$ 2,250	$ 3,020
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,400	1,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 800	$ 1,400