Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, period increase (decrease)	$ 518	$ 50
Income tax expense	$ 869	$ 1,750
Document Period End Date	Mar. 31, 2017
United States
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%