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Bank note payable (Details) (USD $) | 9 Months Ended | 12 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |
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Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 2012 Credit Facility | Sep. 30, 2012 2012 Credit Facility Less than or equal to 25% | Sep. 30, 2012 2012 Credit Facility Greater than 25% to less than or equal to 35% | Sep. 30, 2012 2012 Credit Facility Greater than 35% to less than or equal to 45% | Sep. 30, 2012 2012 Credit Facility Greater than 45% to less than or equal to 55% | Sep. 30, 2012 2012 Credit Facility Greater than 55% | Sep. 30, 2012 2012 Credit Facility Minimum | Sep. 30, 2012 2012 Credit Facility Minimum Greater than 25% to less than or equal to 35% | Sep. 30, 2012 2012 Credit Facility Minimum Greater than 35% to less than or equal to 45% | Sep. 30, 2012 2012 Credit Facility Minimum Greater than 45% to less than or equal to 55% | Sep. 30, 2012 2012 Credit Facility Minimum Greater than 55% | Sep. 30, 2012 2012 Credit Facility Maximum | Sep. 30, 2012 2012 Credit Facility Maximum Less than or equal to 25% | Sep. 30, 2012 2012 Credit Facility Maximum Greater than 25% to less than or equal to 35% | Sep. 30, 2012 2012 Credit Facility Maximum Greater than 35% to less than or equal to 45% | Sep. 30, 2012 2012 Credit Facility Maximum Greater than 45% to less than or equal to 55% | Sep. 30, 2012 2012 Credit Facility LIBOR | Sep. 30, 2012 2012 Credit Facility LIBOR Less than or equal to 25% | Sep. 30, 2012 2012 Credit Facility LIBOR Greater than 25% to less than or equal to 35% | Sep. 30, 2012 2012 Credit Facility LIBOR Greater than 35% to less than or equal to 45% | Sep. 30, 2012 2012 Credit Facility LIBOR Greater than 45% to less than or equal to 55% | Sep. 30, 2012 2012 Credit Facility LIBOR Greater than 55% | Sep. 30, 2012 2012 Credit Facility LIBOR Minimum | Sep. 30, 2012 2012 Credit Facility LIBOR Maximum | Sep. 30, 2012 2012 Credit Facility Bank's base rate | Sep. 30, 2012 2012 Credit Facility Bank's base rate Less than or equal to 25% | Sep. 30, 2012 2012 Credit Facility Bank's base rate Greater than 25% to less than or equal to 35% | Sep. 30, 2012 2012 Credit Facility Bank's base rate Greater than 35% to less than or equal to 45% | Sep. 30, 2012 2012 Credit Facility Bank's base rate Greater than 45% to less than or equal to 55% | Sep. 30, 2012 2012 Credit Facility Bank's base rate Greater than 55% | Sep. 30, 2012 2012 Credit Facility Bank's base rate Minimum | Sep. 30, 2012 2012 Credit Facility Bank's base rate Maximum | Sep. 30, 2012 2012 Credit Facility Federal funds rate | Sep. 30, 2012 2012 Credit Facility One month LIBOR | Sep. 30, 2012 2012 Revolver | Sep. 27, 2012 2012 Revolver | Sep. 30, 2012 2012 Term Loan | Sep. 27, 2012 2012 Term Loan | Sep. 30, 2012 2012 Term Loan LIBOR | Sep. 30, 2012 2011 Revolver | Sep. 27, 2012 2011 Revolver | Dec. 31, 2011 2011 Revolver
Bank note and term note payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total available |  |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  | $ 400,000,000 |  |  | $ 600,000,000 |  |
Borrowings outstanding | 82,000,000 | 449,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,000,000 |  | 400,000,000 |  |  | 482,000,000 | 449,000,000
Term of the borrowing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  | 5 years |  |  |  |  |
Additional borrowing capacity allowed by exercising an accordion feature |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |
Extension available on debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |
Variable base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  | Bank's base rate |  |  |  |  |  |  |  | Federal Funds Rate | One month LIBOR |  |  |  |  | LIBOR |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.45% | 1.35% | 1.40% | 1.45% | 1.65% | 1.90% | 1.35% | 1.90% | 0.45% | 0.35% | 0.40% | 0.45% | 0.65% | 0.90% | 0.35% | 0.90% | 1.00% | 1.00% |  |  |  |  |  |  |  |
Fixed rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75% |  |  |
Overall rate (basis spread plus variable rate), end of period (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.67% |  |  |  |  |  |  |  | 3.70% |  |  |  |  |  |  |  |  |  |  |  | 2.20% |  |  |  |  | 2.24%
Weighted average rate interest rate, during period (as a percent) | 2.31% | 1.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.67% |  |  |  |  |  |  |
Leverage Ratio |  |  |  |  |  |  |  |  |  | 25.00% | 35.00% | 45.00% | 55.00% |  | 25.00% | 35.00% | 45.00% | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility fee (as a percent) |  |  | 0.30% | 0.20% | 0.25% | 0.30% | 0.35% | 0.40% | 0.20% |  |  |  |  | 0.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of interest rate |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 leverage ratio that is calculated by dividing consolidated funded debt (including financial letters of credit) by consolidated earnings before interest, taxes, depreciation, and amortization (EBITDA) as of the reporting period date. + References No definition available. + Details
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- Definition The increase in the maximum borrowing capacity under the credit facility upon excercise of the accordian feature which is subject to receipt of lender commitments and satisfaction of certain customary conditions. + 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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- 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 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + 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 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 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 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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