Equity Transactions - Additional Information (Details) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	May 13, 2020 $ / shares	Feb. 03, 2020 day $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares	May 31, 2020 shares
Equity, Class of Treasury Stock [Line Items]
Preferred stock conversion, threshold consecutive trading days | day		20
Common stock cash dividends declared per share (in $ per share) | $ / shares	$ 0.67		$ 0.67	$ 0.55	$ 1.34	$ 1.10
Repurchases of common shares (in shares)			74,897		185,853
Weighted average price (in $ per share) | $ / shares			$ 100.11		$ 94.13
Total cost of shares repurchased | $			$ 7,500	$ 7,500	$ 17,500	$ 22,499
Additional shares authorized to be repurchased (in shares)							750,000
Shares available for repurchase (in shares)			816,585		816,585
Convertible preferred stock
Equity, Class of Treasury Stock [Line Items]
Preferred stock, shares issuable upon conversion (in shares)		1,150,000
Conversion ratio		0.7938
Conversion price of stock (in $ per share) | $ / shares		$ 125.97
Common stock
Equity, Class of Treasury Stock [Line Items]
Shares issued during period, conversion of convertible preferred stock (in shares)		912,870