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Stock Options and Restricted Shares - Unvested Restricted Awards (Details) - Restricted stock
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Number  
Unvested, beginning of period (in shares) 555,296
Shares awarded (in shares) 207,370
Restrictions lapsed and shares released to associates/directors (in shares) (119,773)
Shares forfeited (in shares) (8,904) [1]
Unvested, end of period (in shares) 633,989
Grant Date Weighted-Average Cost  
Unvested, beginning of period (in dollars per share) | $ / shares $ 57.04
Shares awarded (in dollars per share) | $ / shares 62.61
Restricted lapsed and shares released to associates/directors (in dollars per share) | $ / shares 53.81
Shares forfeited (in dollars per share) | $ / shares 59.79
Unvested, end of period (in dollars per share) | $ / shares $ 59.44
Shares forfeited due to failure to meet performance targets (in shares) 0
[1] Represents shares forfeited due to employee termination and/or retirement. No shares were forfeited due to failure to meet performance targets.