Income Taxes (Net Operating Loss Carry Forwards) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Deferred income tax asset	$ 16,599	$ 16,861
Foreign
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	43,300
Netherlands
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	40,487	24,811
Mexico
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,700	0
China
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,155	825
Portugal
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	0	629
U.S. Federal
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	15,578	23,019
U.S. State and Local Jurisdictions
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 41,812	$ 58,551