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 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Discrete charge for an uncertain tax position $ 520 $ 953  
Foreign statutory tax rate, foreign operations 25.00% 25.00%  
Gross deferred tax asset     $ 72,859
Valuation allowance     64,486
Net deferred tax asset     8,373
Deferred tax liabilities, gross     17,342
Change in valuation allowance for deferred income taxes     48,858
Net operating loss carryforwards for U.S. federal income tax purposes     166,206
Tax windfall     294
Research and experimentation credit carryforwards     2,949
Alternative minimum tax credit carryforwards     $ 316
AMT percentage     20.00%
Maximum percentage of income offset by available NOLs     90.00%
Net operating loss carryforwards, net of limitations     $ 165,912