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Stock-Based Compensation - RSU Activity (Details) - RSUs - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
RSUs        
Non-vested at beginning of period     1,033,631  
Granted     561,497  
Vested     (443,343)  
Non-vested at end of period 1,151,785   1,151,785  
Weighted Average Grant Date Fair Value (in usd per share)        
Non-vested at beginning of period     $ 23.98  
Granted     21.46 $ 25.58
Vested     23.58  
Non-vested at end of period $ 22.91   $ 22.91  
RSUs Additional Disclosures        
Fair value of RSU's vested $ 1,453 $ 1,623 $ 10,455 $ 7,419