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Bank note payable and term note payable (Details) (USD $) |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Dec. 31, 2010 Revolver | May 31, 2011 New Revolver | Jun. 30, 2012 New Revolver Y | Dec. 31, 2011 New Revolver | Feb. 22, 2011 New Revolver | Jun. 30, 2012 New Revolver Minimum | Jun. 30, 2012 New Revolver Maximum | Jun. 30, 2012 New Revolver LIBOR | Jun. 30, 2012 New Revolver LIBOR Minimum | Jun. 30, 2012 New Revolver LIBOR Maximum | Jun. 30, 2012 New Revolver Bank's base rate | Jun. 30, 2012 New Revolver Bank's base rate Minimum | Jun. 30, 2012 New Revolver Bank's base rate Maximum | Jun. 30, 2012 Term Loan Y | Dec. 31, 2010 Term Loan Y option | Jun. 30, 2012 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options for extension |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Extension available on debt (in years) |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  | 1 |
Unsecured term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |
Financial covenant, minimum operating cash |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  | 2.10% | 1.85% | 3.00% | 1.10% | 0.85% | 2.00% |  |  | 2.00%
Facility fee (as a percent) |  |  |  |  | 0.40% |  |  | 0.30% | 0.50% |  |  |  |  |  |  |  |  |
Overall rate (basis spread plus variable rate), end of period (as a percent) |  |  |  |  |  | 2.24% |  |  |  | 2.35% |  |  | 4.35% |  |  |  |  |
Borrowings outstanding | $ 494,000,000 | $ 449,000,000 |  |  | $ 494,000,000 | $ 449,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate, end of period (as a percent) |  |  |  |  | 2.34% |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average rate interest rate, during period (as a percent) |  |  |  |  | 2.28% | 1.95% |  |  |  |  |  |  |  |  |  |  |  |
Variable base 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 Represents the minimum operating cash balance that is required to be maintained under the financial covenant. + References No definition available. + Details
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- Definition Represents the period from the maturity date of the debt for which the debt facility can be extended. + References No definition available. + Details
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- Definition Represents the number of options with the entity to extend the maturity period of debt instruments. + References No definition available. + Details
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- Definition Represents the minimum LIBOR rate that may be charged on a debt agreement. + References No definition available. + Details
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- Definition Represents the initial term of the borrowing, from inception to maturity. + References No definition available. + Details
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- Definition The 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 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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- Details
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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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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 The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Increase for additional borrowings on the credit facility during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 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 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 02 -Subsection 19, 20, 22 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: 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 4: 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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