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Income Taxes: Net Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]      
Deferred Income Tax Expense (Benefit) $ (24,239) $ 80,992 $ 82,704
Deferred Tax Assets, Operating Loss Carryforwards 139,371 $ 155,276  
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 663,741    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 542,632    
Valuation Allowance, Deferred Tax Asset, Change in Amount 3,500    
State and Local Jurisdiction | Valuation Allowance, Operating Loss Carryforwards      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards Valuation Allowance 400    
Valuation Allowance, Deferred Tax Asset, Change in Amount 400    
Valuation Allowance Reduction due to Expired NOL 1,200    
Deferred Income Tax Expense (Benefit) 400    
Deferred Tax Assets, Operating Loss Carryforwards $ 1,200