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Common Shares, Stock Options And Preferred Shares (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 36 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Fixed Stock Option Plan [Member]
Dec. 31, 2011
Employee [Member]
Fixed Stock Option Plan [Member]
Dec. 31, 2011
Non Employee Director [Member]
Fixed Stock Option Plan [Member]
Dec. 31, 2011
Former Executive Officer [Member]
Stock Appreciation Rights [Member]
Dec. 31, 2010
Former Executive Officer [Member]
Stock Appreciation Rights [Member]
Dec. 31, 2009
Former Executive Officer [Member]
Stock Appreciation Rights [Member]
Dec. 31, 2011
3 3/4% Convertible Senior Subordinated Notes Due 2014 [Member]
Dec. 31, 2010
3 3/4% Convertible Senior Subordinated Notes Due 2014 [Member]
Dec. 31, 2011
Warrant [Member]
Dec. 31, 2010
Warrant [Member]
Dec. 31, 2011
Warrants Issued In 2006 [Member]
Dec. 31, 2011
Warrants Issued In 2011 [Member]
Dec. 31, 2011
Stock Option [Member]
Dec. 31, 2010
Stock Option [Member]
Dec. 31, 2011
Corporate [Member]
Dec. 31, 2010
Corporate [Member]
Dec. 31, 2009
Corporate [Member]
Dec. 31, 2011
Treasury Stock [Member]
Dec. 31, 2011
Subsidiary [Member]
Stock Option [Member]
Dec. 31, 2010
Subsidiary [Member]
Stock Option [Member]
Dec. 31, 2009
Subsidiary [Member]
Stock Option [Member]
Common Shares, Stock Options and Preferred Shares [Line Items]                                                
Common shares received upon warrants exercised                           261,599                    
Number of shares acquired during the period                                         4,949      
Average price per share for shares acquired                                         $ 34.92      
Shares authorized to be repurchased 11,987,880                                              
Stock available for grant under fixed stock option plan       1,057,250                                        
Warrants to purchase common shares granted to each of Chairman and President                           2,000,000 2,000,000                  
Exercise price                           $ 28.515 $ 33.84                  
Value of share on exercise date                           $ 32.806                    
Exercise price as a percentage of closing price per share                           105.00% 105.00%                  
Vesting period, years         five four               four                    
Warrants expiration date                           March 5, 2011 2016                  
Vesting upon shareholder approval                             20.00%                  
Additional vesting percentage                             20.00%                  
Vesting tranches                             5                  
Share-based compensation $ 23,264,000 $ 4,260,000 $ 11,106,000                       $ 18,941,000     $ 23,019,000 $ 4,067,000 $ 10,905,000   $ 245,000 $ 193,000 $ 201,000
Decrease in net income as a result of share based compensation 15,203,000 3,955,000 10,905,000                                          
Weighted-average period of share-based compensation plans, years 1.70                                              
Weighted-average fair value per grant $ 13.18 $ 9.09 $ 8.80                       $ 13.35                  
Common shares reserved                   4,327,317 4,279,868 4,000,000 4,000,000     3,308,755 3,564,150              
Total unrecognized compensation cost related to nonvested share-based compensation plans 43,555,000                                              
Preferred shares authorized 6,000,000 6,000,000                                            
Preferred shares, par value $ 1 $ 1                                            
Stock appreciation rights, terms in years 7                                              
Expense relating to stock appreciation rights             $ (4,447,000) $ 261,000 $ 3,102,000