Current Liabilities (Details) (USD $)	0 Months Ended
Feb. 17, 2012
Current Liabilities (Textuals)
Unsecured revolving credit facility	$ 500,000,000
Line of Credit New [Member]
Current Liabilities (Textuals)
Maximum ratio of debt to annual earnings before interest, taxes, depreciation and amortization as per agreement	3.25
Minimum ratio of annual earnings before interest, taxes, depreciation and amortization to interest payable as per agreement	3.00
JP Morgan Alternate Base [Member] \| Line of Credit [Member] \| Minimum [Member]
Current Liabilities (Textuals)
Basis spread on variable rate	0.00%
JP Morgan Alternate Base [Member] \| Line of Credit [Member] \| Maximum [Member]
Current Liabilities (Textuals)
Basis spread on variable rate	0.50%
LIBOR [Member] \| Line of Credit [Member] \| Minimum [Member]
Current Liabilities (Textuals)
Basis spread on variable rate	0.90%
LIBOR [Member] \| Line of Credit [Member] \| Maximum [Member]
Current Liabilities (Textuals)
Basis spread on variable rate	1.50%

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Maximum ratio of debt to annual earnings before interest, taxes, depreciation and amortization as per agreement.

+ References

No definition available.

+ Details

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- Definition

Minimum ratio of annual earnings before interest, taxes, depreciation and amortization to interest payable as per agreement.

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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