Debt (Details) (USD $)
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9 Months Ended | 1 Months Ended | 1 Months Ended | 9 Months Ended | ||||||||
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Sep. 30, 2012
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Jan. 01, 2012
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May 30, 2008
2015 Notes [Member]
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Sep. 30, 2012
2015 Notes [Member]
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Oct. 25, 2011
2021 Notes [Member]
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Sep. 30, 2012
2021 Notes [Member]
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Jan. 01, 2012
2021 Notes [Member]
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Sep. 30, 2012
Financing Lease Obligations [Member]
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Sep. 30, 2012
Unsecured Revolving Credit Facility [Member]
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Sep. 30, 2012
Unsecured Revolving Credit Facility [Member]
Eurocurrency Rate [Member]
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Sep. 30, 2012
Unsecured Revolving Credit Facility [Member]
Base Rate Option Two [Member]
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Oct. 25, 2011
Issuance of Debt [Member]
2021 Notes [Member]
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Unsecured revolving credit facility, amount | $ 700,000,000 | |||||||||||
Unsecured revolving credit facility, expiry date | December 16, 2016 | |||||||||||
Letters of credit issued and outstanding | 12,000,000 | |||||||||||
Interest rate terms under amended senior unsecured revolving credit facility | The interest rates under the senior unsecured revolving credit facility are based on the Eurocurrency rate at the time of borrowing plus a margin, or the base rate from time to time. The base rate is the higher of (i) the rate of interest in effect for such day as publicly announced from time to time by Bank of America, N.A. as its "prime rate," (ii) the Federal Funds rate plus 50 basis points or (iii) one-month Libor plus 1.00%. | |||||||||||
Weighted average interest rates under amended senior unsecured revolving credit facility | The Eurocurrency margin as of September 30, 2012 was 130 basis points. The weighted average Eurocurrency interest rate as of September 30, 2012 was 0.22%, resulting in a weighted average effective Eurocurrency rate, including the margin, of 1.52%. | |||||||||||
Description of variable rate basis | Eurocurrency | Federal Funds | ||||||||||
Basis spread on variable rate | 1.30% | 0.50% | ||||||||||
Weighted average Eurocurrency interest rate | 0.22% | |||||||||||
Weighted average effective Eurocurrency rate, including the margin | 1.52% | |||||||||||
Aggregate borrowings under the amended facility | 256,000,000 | 298,000,000 | ||||||||||
Unsecured senior notes, interest rate percent | 6.00% | 5.00% | ||||||||||
Unsecured senior notes, face value | 150,000,000 | 150,000,000 | 500,000,000 | 500,000,000 | ||||||||
Gross proceeds from the issuance of debt instrument | 150,000,000 | 496,900,000 | ||||||||||
Senior unsecured notes issuance as percentage of principal amount | 99.372% | |||||||||||
Debt Instrument, Unamortized Discount | 3,100,000 | 2,900,000 | 3,100,000 | |||||||||
Debt instrument maturity date | May 30, 2015 | Nov. 25, 2021 | ||||||||||
Percentage of redemption of senior notes on or after August 15, 2021 | 100.00% | |||||||||||
Percentage of redemption upon a change of control and a contemporaneous downgrade of the Notes | 101.00% | |||||||||||
Other Long-term Debt | 29,300,000 | |||||||||||
Maximum Additional Financing Lease Obligations | 15,000,000 | |||||||||||
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 600,000 | |||||||||||
Long-term Debt, Maturities, Repayments of Principal in Year Two | 1,700,000 | |||||||||||
Long-term Debt, Maturities, Repayments of Principal in Year Three | 2,600,000 | |||||||||||
Long-term Debt, Maturities, Repayments of Principal in Year Four | 2,600,000 | |||||||||||
Long-term Debt, Maturities, Repayments of Principal in Year Five | 2,600,000 | |||||||||||
Long-term Debt, Maturities, Repayments of Principal after Year Five | $ 27,000,000 |