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Bank and Other Notes Payable: (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 15, 2012
Senior Notes
Mar. 16, 2007
Senior Notes
Dec. 31, 2012
Senior Notes
Dec. 31, 2013
Line of Credit
Dec. 31, 2012
Line of Credit
Aug. 06, 2013
Line of Credit
Low end of range
Dec. 31, 2013
Line of Credit
Low end of range
Aug. 06, 2013
Line of Credit
High end of range
Dec. 31, 2013
Line of Credit
High end of range
Dec. 08, 2011
Unsecured term loan
Dec. 31, 2013
Unsecured term loan
Dec. 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
Dec. 31, 2012
Greeley Note
Mar. 29, 2013
Prasada Note
Dec. 31, 2013
Prasada Note
Bank and other notes payable                                        
Debt issued         $ 950,000,000               $ 125,000,000 $ 125,000,000         $ 13,330,000  
Interest rate on debt (as a percent)         3.25%                           5.25%  
Repayment of Senior Notes       439,318,000                                
Repurchase and retirement of debt           180,314,000                            
Repurchase of convertible senior notes 0 0 180,314,000     180,792,000                            
Loss (gain) on early extinguishment of debt, net 1,432,000 0 (1,485,000)     (1,449,000)                            
Revolving line of credit             1,500,000,000                          
Variable interest rate spread (as a percent)             1.50%   1.375% 1.75% 2.00% 3.00%   2.20%   1.95% 3.20%      
Term of extension             1 year                          
Maximum expanded revolving line of credit             2,000,000,000                          
Reference rate for variable interest rate             LIBOR           LIBOR LIBOR            
Borrowings under line of credit             30,000,000 675,000,000                        
Average interest rate (as a percent)             1.85% 2.76%                        
Interest rate (as a percent)                           2.51% 2.57%          
Fair value of line of credit             28,214,000 675,107,000                        
Estimated fair value of term loan                           120,802,000 121,821,000         13,114,000
Carrying value of term loan                                   $ 24,027,000   $ 12,537,000