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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
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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 |  |  |  |  |  |

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- Definition The expanded maximum borrowing capacity to which the credit facility can be adjusted depending on certain conditions. + References No definition available. + Details
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- Definition The term of the extension option on the credit facility. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash outflow for a long-term borrowing where lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets as it matures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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