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Business Combinations Business Combination Pro Forma (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]    
Business Acquisition, Pro Forma Revenue $ 227,585 $ 225,753
Business Acquisition, Pro Forma Net Income (Loss) $ 85,720 $ 94,509
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 5.18 $ 5.64
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 5.15 $ 5.59