Equity Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 1.50	$ 1.50	$ 0.82	$ 0.82	$ 4.64	$ 2.98	$ 2.44
Dividends					$ 37,200
Dividends payable	$ 14,824				$ 14,824	$ 9,013
Repurchases of common shares (in shares)					193,193
Weighted average price (in dollars per share)					$ 297.60
Total cost of shares repurchased					$ 57,499	$ 32,500	$ 40,000
Shares available for repurchase (in shares)	529,449				529,449