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Subsequent Events (Details) (USD $)	1 Months Ended					1 Months Ended
	Apr. 30, 2013	Jun. 01, 2013	May 01, 2013	Apr. 05, 2013	Mar. 31, 2013	Apr. 30, 2013 Bond Issuance	Apr. 04, 2013 Bond Issuance		Apr. 08, 2013 Bond Redemptions
Subsequent Events
Percent of par value							100.00%		100.00%
Amount of bond issuance (redemption)	$ (22,000,000)					$ 13,000,000
Debt Instrument, Interest Rate, Effective Percentage							3.15%	[1]	4.30%	[1]
Revolving Credit Facility 1				$ 500,000,000	$ 500,000,000
PARRS interest rate prior to rate reset		4.06%	4.15%
PARRS interest rate after rate reset		3.83%	3.96%
[1] The 2012 Series B bonds were issued at 97.49 percent of par.

X

- Definition

The PARRS interest rate after rate reset.

+ References

No definition available.

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- Definition

The PARRS interest rate prior to rate reset.

+ References

No definition available.

+ Details

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- Definition

The percent of par value that debt was redeemed for.

+ References

No definition available.

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X

- Definition

Amount of current borrowing capacity under the first revolving credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

No definition available.

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X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

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- Definition

The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-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.

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