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Debt (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Debt |  |  |
Credit facility, maximum borrowing capacity | $ 311,000,000 |  |
Amount of interest costs incurred, capitalized, and expensed |  |  |
Interest costs incurred | 909,000 | 661,000 | 518,000
Less: Interest capitalized | (116,000) | (88,000) | (174,000)
Interest expense | 793,000 | 573,000 | 344,000
Primary revolving line of credit |  |  |
Debt |  |  |
Credit facility, maximum borrowing capacity | 300,000,000 |  |
Primary revolving line of credit | Maximum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 0.45% |  |
Facility fees on the available commitment of the facility (as a percent) | 0.30% |  |
Primary revolving line of credit | Minimum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 0.00% |  |
Facility fees on the available commitment of the facility (as a percent) | 0.15% |  |
Primary revolving line of credit | LIBOR |  |  |
Debt |  |  |
Credit facility, interest rate basis | LIBOR |  |
LIBOR Rate at end of period (as a percent) | 0.21% |  |
Primary revolving line of credit | LIBOR | Maximum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 1.45% |  |
Primary revolving line of credit | LIBOR | Minimum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 0.60% |  |
Primary revolving line of credit | Base rate |  |  |
Debt |  |  |
Credit facility, interest rate basis | Base rate |  |
Other revolving credit lines and long term debt |  |  |
Debt |  |  |
Total Borrowing Capacity | 11,000,000 |  |
Credit facility, interest rate low end of range (as a percent) | 0.987% |  |
Credit facility, interest rate high end of range (as a percent) | 7.25% |  |
Total outstanding balances | $ 200,000 |  |

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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 When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement 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 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 Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + 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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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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