Income Taxes Operating Loss Carryforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, research and development	$ 300
Valuation allowance	3,489	$ 1,772
Tax Cuts and Jobs Act of 2017,Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Existing Income Tax Expense (Benefit)	$ 5,400
Impact of Tax Act	(1.80%)	0.00%	0.00%
Missouri Tax Authority [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 200
Connecticut Tax Authority [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	4,700
Japanese Tax Authority [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	7,800
Mexican Tax Authority [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	2,800
Canada Revenue Agency [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 100