Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Taxes [Abstract]          
Statutory income tax benefit     21.00%   35.00%
Tax Cuts and Jobs Act of 2017, Transition Tax, Tax Benefit, If Recognized         $ 2,500
Tax Cuts and Jobs Act of 2017, Valuation Allowance, Federal         4,512
Tax Cuts and Jobs Act of 2017, Valuation Allowance, State, If Recognized         400
Foreign statutory tax rate, foreign operations 25.00%   25.00%    
Gross deferred tax asset         50,732
Valuation allowance         45,811
Net deferred tax asset         4,921
Deferred tax liabilities, gross         8,587
Discrete benefit (charge) associated with tax effect $ 24 $ (102) $ 52 $ 235  
Tax Cuts and Jobs Act of 2017, Percentage of Deferred Tax Asset Which Can be Used for Offset     80.00%    
Net operating loss carryforwards for U.S. federal income tax purposes         156,598
Research and experimentation credit carryforwards         3,452
Alternative minimum tax credit carryforwards         $ 0