Income Taxes Gross Activity of Unrecognized Tax Benefits Related to Uncertain Tax Positions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ 0	$ 0	$ 0
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0.1	100,000.0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,100,000	300,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible	100,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0	0
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	1,255,000	0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	0	(247,000)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	(307,000)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0	0
Unrecognized Tax Benefits	1,739,000	484,000	$ 1,038,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 0	$ 0