Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Income tax provision (benefit)	$ 5	$ (744)
Tax benefit associated with equity awards	500
Unrecognized tax benefits	10,500			$ 10,500
Tax benefits that, if recognized, would affect the effective tax rate	$ 2,300			$ 2,300
Forecast
Income Taxes [Line Items]
Effective tax rate estimate			37.00%