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Stock Incentive Plans - Restricted Stock Units Award Activity (Details) - Restricted Stock Units (RSUs) - $ / shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Number Of Shares (in thousands)        
Outstanding, beginning balance (in shares)     363  
RSUs settled (in shares)     (255)  
RSUs forfeited (in shares)     (27)  
RSUs granted (in shares)     137  
RSUs outstanding, ending balance (in shares) 218 400 218 400
RSUs expected to vest (in shares) 208   208  
Weighted Average Grant Date Fair Value        
Outstanding, beginning balance (in usd per share)     $ 22.76  
RSUs settled (in usd per share)     20.27  
RSUs forfeited (in used per share)     28.27  
RSUs granted (in usd per share) $ 21.52 $ 25.20 26.77 $ 29.28
RSUs outstanding, ending balance (in usd per share) 27.49   27.49  
RSUs expected to vest (in usd per share) $ 27.52   $ 27.52