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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.

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