Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, period increase (decrease)			$ 700	$ 594
Income tax expense	$ 789	$ 1,877	$ 1,121	$ 5,410
Document Period End Date			Sep. 30, 2016
United States
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%