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