Income Tax Uncertainties (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Income Tax Uncertainties
Unrecognized tax benefits, including penalties and interest that if recognized would impact effective tax rate	$ 2,700	$ 2,700	$ 2,700
Unrecognized tax benefits, including penalties and interest, net of federal tax benefit that if recognized would affect effective tax rate	2,300	2,300	2,400
Unrecognized tax benefits, reduced	38	79
Accrued interest and penalties related to uncertain tax positions	700	700	700
Accrued interest and penalties related to uncertain tax positions, net of federal benefit	$ 600	$ 600	$ 600