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, 2015
Sep. 30, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Gross deferred tax asset     $ 73,465
Valuation allowance     16,081
Net deferred tax asset     57,384
Deferred tax liabilities, gross     21,644
Change in valuation allowance for deferred income taxes $ 49,194    
Charge to income tax from valuation allowance   $ 48,335  
Net operating loss carryforwards for U.S. federal income tax purposes     167,303
Tax windfall     294
Research and experimentation credit carryforwards     1,337
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     $ 167,009