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Shareholders Equity (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 19, 2021 USD ($) shares | Jun. 11, 2021 shares | Apr. 22, 2020 | Apr. 20, 2020 | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 $ / shares shares | May 27, 2021 USD ($) item $ / shares shares | Jan. 31, 2017
Common shares |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  | 50 | 0.02 |  |  |  |  |
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) | $ / shares |  |  |  |  | $ 0.05 | $ 0.05 |  |  |
Shares issued in connection with acquisition of carbon capture and hydrogen technologies | 147,974 |  |  |  |  |  |  |  |
Value of shares issued in connection with acquisition of carbon capture and hydrogen technologies | $ | $ 12,900 |  |  |  |  |  |  |  |
Number of shares that are forfeitable if certain milestones are not achieved over the next two years | 71,280 | 0.40 |  |  |  |  |  |  |
Preferred shares, shares authorized |  |  |  |  | 25,000,000.0 |  |  |  |
Treasury shares reissued during the year |  |  |  |  | 0 | 0 | 0 |  |
Preferred stock, rate (as a percent) |  |  |  |  | 6.00% | 6.00% |  |  |
Preferred shares, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 |  |  |
Total aggregate amount of shares purchased | $ |  |  |  |  |  | $ 13,859 |  |  |
Preferred stock, liquidation preference (in dollars per share) | $ / shares |  |  |  |  | 50 | $ 50 |  |  |
Preferred Stock, Dividends Per Share, Declared | $ / shares |  |  |  |  | $ 0.75 | $ 3.00 | $ 3.00 |  |
Number of right share for each outstanding common share |  |  |  |  |  |  |  | 1 |
Number of warrants issued |  | 3,200,000 |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 166.66667 |
Number of additional securities |  |  |  |  |  |  |  | 0.333 |
Multiplying factor for exercise of warrants | item |  |  |  |  |  |  |  | 3 |
Percentage volume weighted average price of stock times factor must exceed sum of volume weighted average prices of second, third and fourth days before exercise |  |  |  |  |  |  |  | 6.00% |
Conversion price percentage |  |  |  |  |  |  |  | 95.00% |
Fair value of the Warrants | $ |  |  |  |  | $ 100 |  |  | $ 2,700 |
Gain for the decrease in liability | $ |  |  |  |  | $ 2,600 |  |  |  |
Preferred stock, shares outstanding |  |  |  |  | 0 | 4,870,000 |  |  |
5.10% senior notes due September 2023 |  |  |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 5.10% | 5.10% |  |  |
0.75% senior exchangeable notes due January 2024 |  |  |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 0.75% |  |  |  | 0.75%
5.75% senior notes due February 2025 |  |  |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 5.75% |  |  |  |
7.25% senior notes due January 2026 |  |  |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 7.25% |  |  |  |
Treasury Stock |  |  |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  |
Total aggregate amount of shares purchased | $ |  |  |  |  |  | $ 1,731 |  |  |
Shares repurchased |  |  |  |  |  | 34,000 |  |  |

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