Annual report pursuant to Section 13 and 15(d)

Income Taxes (Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details)

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Income Taxes (Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Interest [Roll Forward]      
Balance at beginning of year $ 3,418 $ 2,011 $ 910
Additions based on tax positions related to the current year 648 630 525
Additions for tax positions of prior years 536 777 576
Reductions for tax positions of prior years (34) 0 0
Balance at end of year $ 4,568 $ 3,418 $ 2,011