Income Taxes Income Tax (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Valuation Allowance [Line Items]
Provision for income taxes	$ 7,501	$ 10,928	$ 22,061	$ 25,587
Effective Income Tax Rate Reconciliation, Percent	40.70%	41.20%	38.00%	39.90%