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Income Taxes (Summary Of Company's Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current Tax Expense      
Federal     $ 2
State $ 44 $ 32 34
Foreign 72 8  
Total current tax expense 116 40 36
Deferred Tax Expense      
Federal 18,485 (7,333) (7,154)
State (1,337) 210 (398)
Foreign (2,241) (1,177) (955)
Change in valuation allowance (15,009) 8,300 8,507
Total deferred tax expense (102)
Total tax expense $ 14 $ 40 $ 36