Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Examination [Line Items]
Accrued interest expense	$ 30	$ 23
Gross liability for unrecognized tax benefits	2,700
Unrecognized tax benefits that would impact our effective tax rate	2,100
Interest included in total liability	400
Significant increases or decreases for uncertain tax positions	$ 0
State and Foreign Tax Authorities | Minimum
Income Tax Examination [Line Items]
Period of statute of limitations (years)	3 years
State and Foreign Tax Authorities | Maximum
Income Tax Examination [Line Items]
Period of statute of limitations (years)	4 years