Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Foreign statutory tax rate, foreign operations	25.00%
Gross deferred tax asset		$ 47,922
Valuation allowance		42,122
Net deferred tax asset		5,800
Deferred tax liabilities, gross		8,719
Net operating loss carryforwards for U.S. federal income tax purposes		141,067
Research and experimentation credit carryforwards		$ 3,791