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Bank and Other Notes Payable: Bank and Other Notes Payable: (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2013
Mar. 15, 2012
Convertible Notes Payable
Mar. 16, 2007
Convertible Notes Payable
Sep. 30, 2013
Convertible Notes Payable
Sep. 30, 2013
Line of Credit
Dec. 31, 2012
Line of Credit
Aug. 06, 2013
Line of Credit
May 02, 2011
Line of Credit
Dec. 08, 2011
Unsecured term loan
Sep. 30, 2013
Unsecured term loan
Dec. 31, 2012
Unsecured term loan
Dec. 31, 2012
Greeley Note
Mar. 29, 2013
Prasada Note
Sep. 30, 2013
Prasada Note
Aug. 06, 2013
Low end of range
Line of Credit
Sep. 30, 2013
Low end of range
Line of Credit
Dec. 08, 2011
Low end of range
Unsecured term loan
Aug. 06, 2013
High end of range
Line of Credit
Sep. 30, 2013
High end of range
Line of Credit
Dec. 08, 2011
High end of range
Unsecured term loan
Debt Instrument [Line Items]                                        
Amount of additional borrowing     $ 950,000           $ 125,000 $ 125,000     $ 13,330              
Interest rate on debt (as a percent)       3.25%                 5.25%              
Maturities of subordinated debt   439,318                                    
Revolving line of credit               1,500,000                        
Interest rate spread over basis (as a percent) 1.50%                 2.20%         1.375% 1.75% 1.95% 2.00% 3.00% 3.20%
Expansion borrowing capacity         2,000,000   2,000,000                          
Term of extension (in years)         1 year                              
Interest rate basis (as a percent)                 LIBOR LIBOR                    
Outstanding borrowings under the line of credit         145,000 675,000                            
Line of credit, average interest rate (as a percent)         1.86% 2.76%                            
Fair value of outstanding line of credit         137,160 675,107                            
Interest rate (as a percent)                   2.53% 2.57%                  
Debt, carrying value                       24,027   12,937            
Debt, fair value                   $ 118,703 $ 121,821     $ 13,612