Stock Options and Restricted Shares - Unvested Restricted Awards (Details) - Restricted stock	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Number
Unvested, beginning of period (in shares)	594,669
Shares awarded (in shares)	183,839
Restrictions lapsed and shares released to associates/directors (in shares)	(129,599)
Shares forfeited (in shares)	(11,420)
Unvested, end of period (in shares)	637,489
Grant Date Weighted-Average Cost
Unvested, beginning of period (in dollars per share) | $ / shares	$ 56.97
Unvested, end of period (in dollars per share) | $ / shares	$ 61.00