Income Taxes Details (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2018	Dec. 31, 2014
Deferred Tax Assets, Net, Current			$ 6,800
Deferred Tax Assets, Valuation Allowance			(18,627)		$ (1,504)
Deferred Tax Assets, Operating Loss Carryforwards, Net			88,762
Undistributed Earnings of Foreign Subsidiaries			$ 20,300
Foreign equality tax rate			14.00%		9.00%
Combined foreign statutory tax rate			39.00%
Net Worth Tax Obligation			$ 1,200
Subsequent Event [Member]
Foreign equality tax rate	17.00%	15.00%		18.00%
Combined foreign statutory tax rate	42.00%	40.00%		43.00%
Net Worth Tax Obligation	$ 300	$ 700
Capital Loss Carryforward [Member]
Deferred Tax Assets, Valuation Allowance			(700)
Valuation Allowance, Operating Loss Carryforwards [Member] | State and Local Jurisdiction [Member]
Deferred Tax Assets, Valuation Allowance			(2,800)
Valuation Allowance, Operating Loss Carryforwards [Member] | Foreign Tax Authority [Member]
Deferred Tax Assets, Valuation Allowance			$ (15,100)