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Long-term debt outstanding (Details 4) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Long-term debt maturities [Abstract]
2014	$ 12,300,000
2015	269,400,000
2016	293,800,000
2017	204,900,000
2018	130,200,000
Thereafter	944,000,000
Senior notes [Member]
Long term debt outstanding [Abstract]
Weighted average interest rate	5.52%
Commercial paper [Member]
Long term debt outstanding [Abstract]
Weighted average interest rate	0.40%
Term loan agreements [Member]
Long term debt outstanding [Abstract]
Weighted average interest rate	2.08%
Medium-term notes [Member]
Long term debt outstanding [Abstract]
Weighted average interest rate	7.32%
Other notes [Member]
Long term debt outstanding [Abstract]
Weighted average interest rate	5.23%
Loans payable [Member]
Long term debt outstanding [Abstract]
Weighted average interest rate	4.11%
Long-term debt [Member]
Long term debt outstanding [Abstract]
Long-term debt	1,854,563,000	1,744,975,000
Less current maturities	12,277,000	134,108,000
Long-term debt	1,842,286,000	1,610,867,000
Long-term debt [Member] | Senior notes [Member]
Long term debt outstanding [Abstract]
Long-term debt	1,545,078,000	1,349,160,000
Long-term debt [Member] | Commercial paper [Member]
Long term debt outstanding [Abstract]
Long-term debt	153,924,000	293,000,000
Long-term debt [Member] | Term loan agreements [Member]
Long term debt outstanding [Abstract]
Long-term debt	75,000,000	0
Long-term debt [Member] | Medium-term notes [Member]
Long term debt outstanding [Abstract]
Long-term debt	35,000,000	59,000,000
Long-term debt [Member] | Other notes [Member]
Long term debt outstanding [Abstract]
Long-term debt	39,863,000	40,090,000
Long-term debt [Member] | Loans payable [Member]
Long term debt outstanding [Abstract]
Long-term debt	5,701,000	3,768,000
Long-term debt [Member] | Discount on commercial paper program [Member]
Long term debt outstanding [Abstract]
Long-term debt	$ (3,000)	$ (43,000)

X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-Publisher SEC

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-Number 210

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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