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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Aug. 29, 2016
Aug. 15, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]              
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense   $ (17,200)          
Qualifying Assets Placed In Service, Expensed $ 2,900            
Unrecognized tax benefits 0 0 $ 0     $ 814 $ 515
Increase (Decrease) To Deferred Tax Liability, Re-measurement Upon Completion Of Tax Examination       $ 600      
State              
Operating Loss Carryforwards [Line Items]              
Operating loss carryforwards $ 36,400 $ 36,400          
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority       $ 600 $ 200