Income Taxes - Carryovers and allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Tax credit carryovers	$ 4,500	$ 4,600
Increase in valuation allowance	21,000
Net tax effect	27,121	8,983
Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryovers	2,200	3,300
Foreign Tax Authority [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryovers	$ 9,900	$ 22,400