Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, period increase (decrease)			$ 3,280	$ 50
Income tax expense	$ (302)	$ (1,418)	$ 567	$ 332
Document Period End Date			Jun. 30, 2017
United States
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%