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Shareholders Equity (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 11, 2021
shares
May 03, 2021
shares
May 27, 2020
May 05, 2020
$ / shares
shares
Apr. 20, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
$ / shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
May 27, 2021
USD ($)
item
$ / shares
shares
Apr. 24, 2020
shares
Apr. 19, 2020
$ / shares
shares
Jan. 31, 2017
Common shares                            
Reverse stock split ratio         50                  
Common shares, shares authorized         16,000,000   32,000,000   32,000,000     32,000,000 800,000,000  
Fractional common shares issued         0                  
Common shares, par value (in dollars per share) | $ / shares         $ 0.05   $ 0.05   $ 0.05       $ 0.001  
Common stock shares authorized increase percentage         100.00%                  
Common stock shares authorized amount | $         $ 1,600,000                  
Preferred stock, rate (as a percent)             6.00%   6.00%          
Preferred shares, par value (in dollars per share) | $ / shares             $ 0.001   $ 0.001          
Preferred stock, liquidation preference (in dollars per share) | $ / shares             50   $ 50          
Preferred Stock, Dividends Per Share, Declared | $ / shares           $ 0.75 $ 0.75 $ 1.50            
Number of right share for each outstanding common share                     1      
Number of warrants received per common share held 0.40                          
Number of warrants issued 3,236,430                          
Gain for the decrease in liability | $             $ 1,700,000              
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 | $             $ 1,000,000.0       $ 2,700,000      
Minimum percentage beneficial ownership to trigger rights exercise (as a percent)     10.00% 4.90%                    
Percentage discount that a rights holder is entitled to when purchasing additional shares (as a percent)       50.00%                    
Price per share at which the Rights may be redeemed       0.01                    
Exchange ratio after rights trigger       1                    
Preferred stock, shares outstanding             0   4,870,000          
5.10% senior notes due September 2023                            
Common shares                            
Interest rate (as a percent)             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%              
Specific Shareholder                            
Common shares                            
Minimum percentage beneficial ownership to trigger rights exercise (as a percent)       10.00%                    
Acquiring Company                            
Common shares                            
Percentage discount that a rights holder is entitled to when purchasing additional shares (as a percent)       50.00%                    
Minimum                            
Common shares                            
Reverse stock split ratio         15                  
Additional ownership percentage acquired for right trigger       0.50%                    
Maximum                            
Common shares                            
Reverse stock split ratio         50                  
Mandatory Convertible Preferred Shares                            
Common shares                            
Preferred stock, shares issued                   5,750,000        
Preferred stock, rate (as a percent)                   6.00%        
Preferred shares, par value (in dollars per share) | $ / shares                   $ 0.001        
Preferred stock, liquidation preference (in dollars per share) | $ / shares                   $ 50        
Preferred stock, shares outstanding                 4,900,000          
Series B Preferred Stock                            
Common shares                            
Preferred shares, par value (in dollars per share) | $ / shares       $ 0.001                    
Number of right share for each outstanding common share       1                    
Number of shares each right entitled to purchase       0.001                    
Exercise price (in dollars per share) | $ / shares       $ 58.08                    
Common Stock | Mandatory Convertible Preferred Shares                            
Common shares                            
Shares issued   668,000