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Bank note payable and term note payable (Details) (USD $) | 9 Months Ended |  | 9 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 9 Months Ended | 1 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 1 Months Ended | 9 Months Ended |  | 9 Months Ended |
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Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2011 Revolver | Sep. 30, 2010 Revolver | Dec. 31, 2010 Revolver | Feb. 22, 2011 Revolver | Dec. 31, 2010 Revolver LIBOR | Feb. 22, 2011 Revolver LIBOR | Sep. 30, 2011 Revolver Bank's base rate | May 31, 2011 New Revolver | Sep. 30, 2011 New Revolver Y | May 19, 2011 New Revolver | Feb. 22, 2011 New Revolver | Sep. 30, 2011 New Revolver LIBOR | Sep. 30, 2011 New Revolver Bank's base rate | Feb. 28, 2011 Term Loan | Sep. 30, 2011 Term Loan Y | Dec. 31, 2010 Term Loan | Sep. 30, 2011 Term Loan LIBOR | Feb. 22, 2011 Term Loan LIBOR
Bank note and term note payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total available |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  | $ 600,000,000 | $ 500,000,000 |  |  |  |  |  |  |
Additional borrowing capacity allowed by exercising an accordion feature |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |
Repayment | 74,850,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |
Financial covenant, minimum operating cash |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |
Extension available on debt (in years) |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Basis spread on variable rate, low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.85% | 0.85% |  |  |  |  |
Basis spread on variable rate, high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 2.00% |  |  |  |  |
Basis spread on variable rate, end of period (as a percent) |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  | 1.95% | 0.95% |  |  |  |  | 2.00%
Facility fee, low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |
Facility fee, high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |
Facility fee, end of period (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.35% |  |  |  |  |  |  |  |  |
Overall rate (basis spread plus variable rate), end of period (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.19% | 4.20% |  |  |  |  |
Borrowings outstanding | $ 375,000,000 | $ 209,968,000 |  |  | $ 209,968,000 |  |  |  |  |  | $ 375,000,000 |  |  |  |  |  |  |  |  |
Weighted average interest rate, end of period (as a percent) |  |  |  |  | 1.26% |  |  |  |  |  | 2.19% |  |  |  |  |  |  |  |  |
Weighted average interest rate, during period (as a percent) |  |  | 1.95% | 1.29% | 1.33% |  |  |  |  |  | 1.95% |  |  |  |  |  |  |  |  |
Variable base rate |  |  |  |  |  |  | LIBOR |  | Bank's prime rate |  |  |  |  | LIBOR | Bank's base rate |  |  |  | LIBOR |
Minimum interest rate (as as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |
Initial term of the borrowing (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Fixed interest rate pursuant to interest rate swap contract (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.84% |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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