Income Taxes Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning	$ 3,370	$ 3,570
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	60	250
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	390	860
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0	(100)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	0	0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(800)	(1,210)
Unrecognized Tax Benefits, Ending	$ 3,020	$ 3,370