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Stock-based Compensation Restricted Stock Awards (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Beginning balance 451,160 256,842 350,631
Granted 459,523 375,313 23,659
Vested (276,184) (149,213) (116,877)
Forfeited (52,556) (31,782) (571)
Ending balance 581,943 451,160 256,842
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Roll Forward]      
Beginning balance (usd per share) $ 22.16 $ 4.77 $ 4.77
Restricted stock awards granted (usd per share) 30.03 28.10 30.19
Awards upon which restrictions lapsed (usd per share) 18.20 9.74 4.77
Restricted stock awards forfeited (usd per share) 29.85 28.57 30.19
Ending balance (usd per share) $ 29.56 $ 22.16 $ 4.77