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v3.20.4

Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 27, 2021 | Feb. 23, 2021 | Feb. 05, 2021 | May 05, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020
Common Shares |  |  |  |  |  |  |  |
Authorized share capital |  |  |  |  | 57,000,000.0 |  |  |
Common shares, shares authorized |  |  |  |  | 32,000,000 | 32,000,000 |  |
Common shares, par value (in dollars per share) |  |  |  |  | $ 0.05 | $ 0.05 |  |
Preferred shares, shares authorized |  |  |  |  | 25,000,000.0 |  |  |
Preferred shares, par value (in dollars per share) |  |  |  |  | $ 0.001 | $ 0.001 |  |
Total aggregate amount of shares purchased |  |  |  |  | $ 13,859 |  |  |
Stock issued (in shares) |  |  |  |  | 8,383,000 | 8,324,000 |  |
Proceeds from issuance of common shares, net of issuance costs |  |  |  |  |  |  | $ 301,404 |
Treasury shares reissued during the year |  |  |  |  | 0 | 0 | 0 |
Preferred stock, rate (as a percent) |  |  |  |  | 6.00% | 6.00% |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  | $ 50 | $ 50 |  |
Aggregate net proceeds |  |  |  |  |  |  | $ 277,927 |
Cash dividend per mandatory convertible preferred shares (in dollars per share) |  |  |  |  | $ 3.00 | $ 3.00 | $ 2.14 |
Minimum percentage beneficial ownership to trigger rights exercise (as a percent) |  |  |  | 4.90% |  |  |  |
Percentage discount that a rights holder is entitled to when purchasing additional shares (as a percent) |  |  |  | 50.00% |  |  |  |
Exchange ratio after rights trigger |  |  |  | 1 |  |  |  |
Price per share at which the Rights may be redeemed |  |  |  | 0.01 |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  | 4,870,000 | 5,613,000 |  |
Subsequent Event |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Minimum percentage beneficial ownership to trigger rights exercise (as a percent) | 10.00% |  | 7.00% |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  |  | 800,000 |
Share price of shares purchased (in dollars per share) |  |  |  |  |  |  | $ 387.50 |
Proceeds from issuance of common shares, net of issuance costs |  |  |  |  |  |  | $ 301,400 |
Treasury Shares |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  | 34,000 |  |  |
Total aggregate amount of shares purchased |  |  |  |  | $ 1,731 |  |  |
Mandatory Convertible Preferred Shares |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Preferred shares, par value (in dollars per share) |  |  |  |  |  |  | $ 0.001 |
Shares repurchased |  |  |  |  | 900,000 | 136,772 |  |
Total aggregate amount of shares purchased |  |  |  |  | $ 15,000 | $ 2,900 |  |
Amount of shares authorized to be repurchased |  |  |  |  |  |  |  | $ 15,000
Preferred stock, shares issued |  |  |  |  |  |  | 5,750,000 |
Preferred stock, rate (as a percent) |  |  |  |  |  |  | 6.00% |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  | $ 50 |
Mandatory Convertible Preferred Shares | Subsequent Event |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Cash dividend per mandatory convertible preferred shares (in dollars per share) |  | $ 0.75 |  |  |  |  |  |
Mandatory Convertible Preferred Shares | Common Stock |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Number of consecutive trading days to calculate average share price of common stock |  |  |  |  |  |  | 20 days |
Series B Preferred Stock |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Preferred shares, par value (in dollars per share) |  |  |  | $ 0.001 |  |  |  |
Exercise price (in dollars per share) |  |  |  | $ 58.08 |  |  |  |
Number of right share for each outstanding common share |  |  |  | 1 |  |  |  |
Number of shares each right entitled to purchase |  |  |  | 0.001 |  |  |  |
Underwriters option | Mandatory Convertible Preferred Shares |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  |  |  |  | 750,000 |
Underwriters option | Mandatory Convertible Preferred Shares | Common Stock |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Aggregate net proceeds |  |  |  |  |  |  | $ 277,900 |
Minimum |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Additional ownership percentage acquired for right trigger |  |  |  | 0.50% |  |  |  |
Minimum | Common Stock |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  | 0.1144 |
Minimum | Mandatory Convertible Preferred Shares | Common Stock |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  | 0.1075 |
Maximum | Subsequent Event |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Minimum percentage beneficial ownership to trigger rights exercise (as a percent) |  |  | 20.00% |  |  |  |  |
Maximum | Common Stock |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  | 0.1372 |
Maximum | Mandatory Convertible Preferred Shares | Common Stock |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  | 0.1290 |
Acquiring Company |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |
Percentage discount that a rights holder is entitled to when purchasing additional shares (as a percent) |  |  |  | 50.00% |  |  |  |

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