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Equity Transactions - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 19, 2020 $ / shares | Feb. 03, 2020 day $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares | May 31, 2020 shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Preferred stock conversion, threshold consecutive trading days | day |  | 20 |  |  |  |  |
Cash dividends declared per common share (in $ per share) | $ / shares | $ 0.82 |  | $ 0.82 | $ 0.67 | $ 2.16 | $ 1.77 |
Number of additional shares authorized to be repurchased (in shares) |  |  |  |  |  |  | 750,000
Total number of shares authorized to be repurchased since inception (in shares) |  |  |  |  |  |  | 4,930,045
Repurchases of common shares (in shares) |  |  | 53,867 |  | 239,720 |  |
Weighted average price (in $ per share) | $ / shares |  |  | $ 139.20 |  | $ 104.26 |  |
Total cost of shares repurchased | $ |  |  | $ 7,500 | $ 7,501 | $ 25,000 | $ 30,000 |
Shares available for repurchase (in shares) |  |  | 762,718 |  | 762,718 |  |
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 |  |  |  |  |

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