Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Jun. 30, 2016
Income Taxes [Abstract]    
Foreign statutory tax rate, foreign operations   25.00%
Gross deferred tax asset $ 71,288  
Valuation allowance 62,915  
Net deferred tax asset 8,373  
Deferred tax liabilities, gross 17,342  
Change in valuation allowance for deferred income taxes 47,287  
Net operating loss carryforwards for U.S. federal income tax purposes 166,206  
Tax windfall 294  
Research and experimentation credit carryforwards 1,408  
Alternative minimum tax credit carryforwards $ 56  
AMT percentage 20.00%  
Maximum percentage of income offset by available NOLs 90.00%  
Net operating loss carryforwards, net of limitations $ 165,912