Income Taxes Unrecognized Tax Benefits - Annual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 299	$ 299	$ 299
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	$ 0	$ 0