Income Taxes Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, beginning of year	$ 1,022	$ 1,067	$ 549
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	160	163	245
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	0	0	366
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0	0	0
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	0	0	0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(208)	(208)	(93)
Unrecognized Tax Benefits, end of year	$ 974	$ 1,022	$ 1,067