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Bank and Other Notes Payable: (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mar. 31, 2007
Convertible Senior Notes ("Senior Notes")
Dec. 31, 2011
Convertible Senior Notes ("Senior Notes")
call
Dec. 31, 2010
Convertible Senior Notes ("Senior Notes")
Dec. 31, 2009
Convertible Senior Notes ("Senior Notes")
Mar. 12, 2007
Convertible Senior Notes ("Senior Notes")
Dec. 31, 2011
Line of Credit
Y
Apr. 25, 2011
Line of Credit
Dec. 31, 2011
Line of Credit
Low end of range
Apr. 25, 2011
Line of Credit
Low end of range
Dec. 31, 2011
Line of Credit
High end of range
Apr. 25, 2011
Line of Credit
High end of range
Dec. 31, 2011
Greeley Note
Dec. 31, 2010
Greeley Note
Dec. 31, 2011
Term Loans
Apr. 30, 2005
Term Loans
Dec. 31, 2011
Term Loans
Dec. 30, 2011
Term Loans
Dec. 31, 2011
Unsecured term loan
Dec. 08, 2011
Unsecured term loan
Low end of range
Dec. 08, 2011
Unsecured term loan
High end of range
Bank and other notes payable                                              
Debt issued       $ 950,000,000                           $ 450,000,000     $ 125,000,000    
Interest rate on debt (as a percent)         3.25%                               2.42%    
Conversion rate per $1 principal amount         8.9702                                    
Convertible debt principal amount, basis for exchange         1,000                                    
Conversion price (in dollars per share)         $ 111.48                                    
Conversion price, premium over market price (as a percent)         20.00%                                    
Convertible debt, number of capped calls         2                                    
Effective conversion price (in dollars per share)         $ 130.06                                    
Effective conversion price, premium over market price (as a percent)         40.00%                                    
Closing price of common stock (in dollars per share)               $ 92.90                              
Repurchase and retirement of debt         180,314,000 18,468,000 89,065,000                                
Repurchase of convertible senior notes 180,314,000 18,191,000 55,029,000   180,792,000 18,283,000 54,135,000                                
(loss) gain on early extinguishment of debt (10,588,000) 3,661,000 29,161,000   (1,449,000) (489,000) 29,824,000                                
Debt, carrying value         437,788,000 606,971,000                 24,848,000 25,624,000              
Debt, unamortized discount         1,530,000 12,661,000                                  
Term of debt (in years)                                   5   7      
Fair value of debt                                         120,019,000    
Effective interest rate (as a percent)         5.41% 5.41%                 6.34%                
Debt, fair value         437,788,000 619,632,000                 26,510,000 23,967,000              
Revolving line of credit                 1,500,000,000 1,500,000,000                          
Reference rate for variable interest rate                 LIBOR               LIBOR LIBOR LIBOR        
Term of extension (in years)                 1                            
Variable interest rate spread (as a percent)                 2.00%   1.75% 0.75% 3.00% 1.10%       1.50%     2.20% 1.95% 3.20%
Line of credit, average interest rate (as a percent)                 2.96%                            
Outstanding borrowings under the line of credit                 290,000,000                            
Maximum expanded revolving line of credit                 2,000,000,000                            
Fair value of outstanding line of credit                 $ 292,366,000