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Bank and Other Notes Payable: (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2007
Convertible Senior Notes ("Senior Notes")
Mar. 31, 2012
Convertible Senior Notes ("Senior Notes")
Dec. 31, 2011
Convertible Senior Notes ("Senior Notes")
Mar. 31, 2012
Line of Credit
Y
Dec. 31, 2011
Line of Credit
Apr. 25, 2011
Line of Credit
Mar. 31, 2012
Line of Credit
Low end of range
Apr. 25, 2011
Line of Credit
Low end of range
Mar. 31, 2012
Line of Credit
High end of range
Apr. 25, 2011
Line of Credit
High end of range
Dec. 31, 2011
Term Loans
Y
Mar. 31, 2012
Term Loans
Mar. 31, 2012
Greeley Note
Dec. 31, 2011
Greeley Note
Dec. 31, 2011
Unsecured term loan
Mar. 31, 2012
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                           $ 125,000      
Interest rate on debt (as a percent)   3.25%                         2.42% 2.59%    
Conversion rate per $1 principal amount   8.9702                                
Convertible debt principal amount, basis for exchange   1                                
Repayment of Senior Notes   439,318                                
Debt, carrying value     437,788                   24,646 24,848        
Debt, unamortized discount     1,530                              
Term of debt (in years)                     7              
Fair value of debt                             120,019 120,134    
Effective interest rate (as a percent)     5.41%                   6.34%          
Debt, fair value     437,788                   26,050 26,510        
Revolving line of credit       1,500,000   1,500,000                        
Reference rate for variable interest rate       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%           2.20% 1.95% 3.20%
Line of credit, average interest rate (as a percent)       2.78% 2.96%                          
Outstanding borrowings under the line of credit       805,000 290,000                          
Maximum expanded revolving line of credit       2,000,000                            
Fair value of outstanding line of credit       $ 801,748 $ 292,366