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Income Taxes (Reconciliation Of Unrecognized Tax Benefit Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Unrecognized tax benefit, Beginning balance $ 18,735 $ 16,952 $ 11,634
Increase in balance related to tax positions taken in prior year     2,959
Decrease in balance related to tax positions taken in prior year (3,892) (44)  
Increase in balance related to tax positions taken during current year 1,942 1,827 2,359
Unrecognized tax benefit, Ending balance $ 16,785 $ 18,735 $ 16,952