Income Taxes Unrecognized Tax Benefits Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 3,570	$ 4,610	$ 5,270
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3,000	4,100
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 2,000	$ 2,200
Minimum [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2015
Maximum [Member]
Income Tax Contingency [Line Items]
Open Tax Year	2011