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Income Taxes Unrecognized Tax Benefits Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of the year $ 9,632 $ 8,313 $ 6,855
Increases related to current year tax positions 1,575 1,319 1,532
Increases (decreases) related to prior year tax positions (3) 0 (74)
Balance at end of the year $ 11,204 $ 9,632 $ 8,313