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Stockholders' Equity (Unvested Activity Rollforward) (Details)
shares in Thousands
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Weighted-Average, Grant-Date Fair Value Rollforward  
Expected forfeiture rate 4.10%
Restricted Shares  
Shares Rollforward  
Unvested awards - beginning of period (shares) 374
Granted (shares) 295
Converted (shares) 33
Vested (shares) (166)
Forfeited (shares) 0
Unvested awards - end of period (shares) 536
Weighted-Average, Grant-Date Fair Value Rollforward  
Unvested awards - beginning of period (dollars per share) | $ / shares $ 20.96
Granted (dollars per share) | $ / shares 21.06
Vested (dollars per share) | $ / shares 21.22
Forfeited (dollars per share) | $ / shares 0
Unvested awards - end of period (dollars per share) | $ / shares $ 20.94
Performance period 3 years
Shares expected to ultimately vest 514
RSUs  
Shares Rollforward  
Unvested awards - beginning of period (shares) 584
Granted (shares) 303
Converted (shares) (33)
Vested (shares) (101)
Forfeited (shares) (9)
Unvested awards - end of period (shares) 744
Weighted-Average, Grant-Date Fair Value Rollforward  
Unvested awards - beginning of period (dollars per share) | $ / shares $ 18.86
Granted (dollars per share) | $ / shares 18.06
Vested (dollars per share) | $ / shares 18.48
Forfeited (dollars per share) | $ / shares 20.49
Unvested awards - end of period (dollars per share) | $ / shares $ 18.58
Shares expected to ultimately vest 713