Income Taxes Income Tax Contingency (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ (500)	$ (1,100)	$ 900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2,000	2,500	3,600
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	1,044	1,441	1,747
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	(640)	56	(501)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	(1,371)	(947)	0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(816)	(1,188)	(2,117)
Unrecognized Tax Benefits	$ 9,964	$ 11,747	$ 12,385	$ 13,256