Equity Transactions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	May 13, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity [Abstract]
Cash dividends declared per common share (in $ per share)	$ 0.82	$ 0.82	$ 0.67	$ 1.64	$ 1.34
Repurchases of common shares (in shares)		26,921		46,833
Weighted average price (in $ per share)		$ 278.56		$ 266.87
Total cost of shares repurchased		$ 7,500	$ 7,500	$ 12,499	$ 17,500
Shares available for repurchase (in shares)		675,809		675,809