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Bank note payable (Details) (USD $) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Sep. 27, 2012
Bank note and term note payable |  |  |
Borrowings outstanding | $ 181,500,000 | $ 216,750,000 |
Weighted average rate interest rate, during period (as a percent) | 1.65% |  |
2012 Credit Facility |  |  |
Bank note and term note payable |  |  |
Total available | 900,000,000 |  |
Facility fee (as a percent) | 0.30% |  |
2012 Credit Facility | Less than or equal to 25% |  |  |
Bank note and term note payable |  |  |
Facility fee (as a percent) | 0.20% |  |
2012 Credit Facility | Greater than 25% to less than or equal to 35% |  |  |
Bank note and term note payable |  |  |
Facility fee (as a percent) | 0.25% |  |
2012 Credit Facility | Greater than 35% to less than or equal to 45% |  |  |
Bank note and term note payable |  |  |
Facility fee (as a percent) | 0.30% |  |
2012 Credit Facility | Greater than 45% to less than or equal to 55% |  |  |
Bank note and term note payable |  |  |
Facility fee (as a percent) | 0.35% |  |
2012 Credit Facility | Greater than 55% |  |  |
Bank note and term note payable |  |  |
Facility fee (as a percent) | 0.40% |  |
2012 Credit Facility | Minimum |  |  |
Bank note and term note payable |  |  |
Facility fee (as a percent) | 0.20% |  |
2012 Credit Facility | Minimum | Greater than 25% to less than or equal to 35% |  |  |
Bank note and term note payable |  |  |
Leverage Ratio | 25.00% |  |
2012 Credit Facility | Minimum | Greater than 35% to less than or equal to 45% |  |  |
Bank note and term note payable |  |  |
Leverage Ratio | 35.00% |  |
2012 Credit Facility | Minimum | Greater than 45% to less than or equal to 55% |  |  |
Bank note and term note payable |  |  |
Leverage Ratio | 45.00% |  |
2012 Credit Facility | Minimum | Greater than 55% |  |  |
Bank note and term note payable |  |  |
Leverage Ratio | 55.00% |  |
2012 Credit Facility | Maximum |  |  |
Bank note and term note payable |  |  |
Facility fee (as a percent) | 0.40% |  |
2012 Credit Facility | Maximum | Less than or equal to 25% |  |  |
Bank note and term note payable |  |  |
Leverage Ratio | 25.00% |  |
2012 Credit Facility | Maximum | Greater than 25% to less than or equal to 35% |  |  |
Bank note and term note payable |  |  |
Leverage Ratio | 35.00% |  |
2012 Credit Facility | Maximum | Greater than 35% to less than or equal to 45% |  |  |
Bank note and term note payable |  |  |
Leverage Ratio | 45.00% |  |
2012 Credit Facility | Maximum | Greater than 45% to less than or equal to 55% |  |  |
Bank note and term note payable |  |  |
Leverage Ratio | 55.00% |  |
2012 Credit Facility | LIBOR |  |  |
Bank note and term note payable |  |  |
Variable base rate | LIBOR |  |
Basis spread on variable rate (as a percent) | 1.45% |  |
Overall rate (basis spread plus variable rate), end of period (as a percent) | 1.65% |  |
2012 Credit Facility | LIBOR | Less than or equal to 25% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 1.35% |  |
2012 Credit Facility | LIBOR | Greater than 25% to less than or equal to 35% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 1.40% |  |
2012 Credit Facility | LIBOR | Greater than 35% to less than or equal to 45% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 1.45% |  |
2012 Credit Facility | LIBOR | Greater than 45% to less than or equal to 55% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 1.65% |  |
2012 Credit Facility | LIBOR | Greater than 55% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 1.90% |  |
2012 Credit Facility | LIBOR | Minimum |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 1.35% |  |
2012 Credit Facility | LIBOR | Maximum |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 1.90% |  |
2012 Credit Facility | Bank's base rate |  |  |
Bank note and term note payable |  |  |
Variable base rate | Bank's base rate |  |
Basis spread on variable rate (as a percent) | 0.45% |  |
Overall rate (basis spread plus variable rate), end of period (as a percent) | 3.70% |  |
2012 Credit Facility | Bank's base rate | Less than or equal to 25% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 0.35% |  |
2012 Credit Facility | Bank's base rate | Greater than 25% to less than or equal to 35% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 0.40% |  |
2012 Credit Facility | Bank's base rate | Greater than 35% to less than or equal to 45% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 0.45% |  |
2012 Credit Facility | Bank's base rate | Greater than 45% to less than or equal to 55% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 0.65% |  |
2012 Credit Facility | Bank's base rate | Greater than 55% |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 0.90% |  |
2012 Credit Facility | Bank's base rate | Minimum |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 0.35% |  |
2012 Credit Facility | Bank's base rate | Maximum |  |  |
Bank note and term note payable |  |  |
Basis spread on variable rate (as a percent) | 0.90% |  |
2012 Credit Facility | Federal funds rate |  |  |
Bank note and term note payable |  |  |
Variable base rate | Federal Funds Rate |  |
Basis spread on variable rate (as a percent) | 0.50% |  |
2012 Credit Facility | One month LIBOR |  |  |
Bank note and term note payable |  |  |
Variable base rate | One month LIBOR |  |
Basis spread on variable rate (as a percent) | 1.00% |  |
2012 Revolver |  |  |
Bank note and term note payable |  |  |
Total available | 500,000,000 |  |
Borrowings outstanding | 181,500,000 | 216,750,000 | 82,000,000
Term of the borrowing | 4 years |  |
Additional borrowing capacity allowed by exercising an accordion feature | 250,000,000 |  |
Extension available on debt | 12 months |  |
Overall rate (basis spread plus variable rate), end of period (as a percent) |  | 2.23% |
Weighted average rate interest rate, during period (as a percent) | 1.65% |  |
2012 Term Loan |  |  |
Bank note and term note payable |  |  |
Total available | 400,000,000 |  |
Borrowings outstanding |  |  | 400,000,000
Term of the borrowing | 5 years |  |
Overall rate (basis spread plus variable rate), end of period (as a percent) | 2.20% |  |
2012 Term Loan | LIBOR |  |  |
Bank note and term note payable |  |  |
Variable base rate | LIBOR |  |
Fixed rate (as a percent) | 0.75% |  |
2011 Revolver |  |  |
Bank note and term note payable |  |  |
Total available | 600,000,000 |  |
Borrowings outstanding |  |  | $ 482,000,000

X
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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 exercise 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 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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