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Income Taxes (Valuation Allowance on Deferred Tax Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards     $ 201,500
Deferred Tax Assets, Valuation Allowance $ 39,516 $ 28,821  
Federal net operating loss carryforwards 102,806 $ 110,350  
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Total net operating losses 489,600    
Internal Revenue Service (IRS) | General Business Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforwards 11,300    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Federal net operating loss carryforwards $ 936,500