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Interest rate swap agreements (Details) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2011 Designated as hedging instrument | Jun. 30, 2011 Designated as hedging instrument | Jun. 30, 2010 Designated as hedging instrument | Dec. 31, 2011 Designated as hedging instrument | Dec. 31, 2010 Designated as hedging instrument | Mar. 31, 2011 Designated as hedging instrument Medium term notes issued in March 2011 | Mar. 31, 2011 Designated as hedging instrument 5-year medium-term notes at 4.41% | Mar. 31, 2011 Designated as hedging instrument 10-year medium-term notes at 5.67%
Interest rate swap agreements |  |  |  |  |  |  |  |  |
Reference rate of interest rate derivative |  |  |  | three-month LIBOR |  |  |  |  |
Notional amounts of interest rate derivatives |  | $ 125,000,000 | $ 125,000,000 |  |  |  |  |  |
Period over which entity hedges its interest rate derivative (in years) |  |  |  | five-year |  |  |  |  |
Fair value of interest rate derivative recorded in other liabilities |  |  |  |  |  | (2,762,000) |  |  |
Amortization period of forward starting swaps (in years) |  | 5Y |  |  |  |  |  |  |
Payment on settlement of interest rate derivatives |  |  | 5,200,000 |  |  |  |  |  |
Gain (loss) due to ineffective portion of interest rate, cumulative effect, recognized in earnings | 3,300,000 |  |  |  |  |  |  |  |
Gain (loss) due to ineffective portion of interest rate, recognized in earnings |  |  |  |  | 2,500,000 | 800,000 |  |  |
Debt-related disclosures |  |  |  |  |  |  |  |  |
Medium-term notes issued |  |  |  |  |  |  | 125,000,000 | 75,000,000 | 50,000,000
Interest rate of medium-term notes (as a percent) |  |  |  |  |  |  |  | 4.41% | 5.67%
Amount amortized to interest expenses upon settlement |  |  | $ 1,900,000 |  |  |  |  |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + Details
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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(3) -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 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994 + Details
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