Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 1,382	$ 1,307	$ 1,132
Increase related to tax positions taken during a prior year, including interest	351	0	0
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	3,483	75	185
Reductions related to tax positions taken in a prior year, including interest	(1,382)	0	(10)
Balance at end of year	$ 3,834	$ 1,382	$ 1,307