Debt and Credit Agreements (Details) (USD $)
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0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | ||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Sep. 15, 2013
Senior Notes [Member]
5.125% notes due September 15, 2013
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Dec. 31, 2013
U.S. commercial paper program
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Mar. 31, 2012
Credit Agreement
bank
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Dec. 31, 2013
Credit Agreement
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Sep. 30, 2013
Credit Agreement
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Dec. 31, 2013
Senior Notes [Member]
5.125% notes due September 15, 2013
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Dec. 31, 2012
Senior Notes [Member]
5.125% notes due September 15, 2013
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Dec. 31, 2013
Senior Notes [Member]
5.75% notes due May 15, 2018
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Dec. 31, 2012
Senior Notes [Member]
5.75% notes due May 15, 2018
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Line of Credit Facility [Line Items] | ||||||||||||||
Debt Instrument, Redemption Price, Percentage | 5.75% | |||||||||||||
Debt Issuance Cost | $ 300,000 | $ 400,000 | ||||||||||||
Facility Limit | 525,000,000 | 525,000,000 | [1] | |||||||||||
Stated interest rate | 5.125% | 5.125% | 5.75% | 5.75% | ||||||||||
Outstanding Balance | 35,000,000 | 35,000,000 | [1] | |||||||||||
Other Borrowings | 89,500,000 | |||||||||||||
Extinguishment of Debt, Amount | 150,000,000 | |||||||||||||
Available Credit | 490,000,000 | [1] | ||||||||||||
Number of lenders providing credit facility (in banks) | 14 | |||||||||||||
Contingent increase to maximum borrowing capacity | 550,000,000 | |||||||||||||
Variable basis of interest rates | LIBOR | |||||||||||||
Short-term borrowings | $ 7,489,000 | $ 8,560,000 | ||||||||||||
Weighted average interest rate | 10.80% | 4.90% | ||||||||||||
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