Income Taxes Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning	$ 4,610	$ 5,270
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	120	240
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	80	1,570
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	(10)	(360)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	0	(390)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(1,230)	(1,720)
Unrecognized Tax Benefits, Ending	$ 3,570	$ 4,610