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Debt Senior Notes (Details) (USD $) |  | 3 Months Ended | 0 Months Ended |  |  | 3 Months Ended | 0 Months Ended |  | 3 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2013 Senior Notes Due 2013 Senior Notes | Mar. 31, 2013 Senior Unsecured Notes Due April 2023 | Mar. 19, 2013 Senior Unsecured Notes Due April 2023 Senior Notes | Mar. 19, 2013 Registration Rights Agreement [Member] | Mar. 19, 2013 Registration Rights Agreement [Member] Senior Notes | Mar. 31, 2013 Senior Notes Due 2021 Senior Notes | Mar. 31, 2013 Maximum Senior Unsecured Notes Due April 2023 | Mar. 19, 2013 Maximum Senior Unsecured Notes Due April 2023 Senior Notes | Mar. 19, 2013 Maximum Registration Rights Agreement [Member] | Mar. 31, 2013 Minimum Senior Unsecured Notes Due April 2023 | Mar. 19, 2013 Minimum Senior Unsecured Notes Due April 2023 Senior Notes
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Apr. 01, 2023 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.75% | 7.75% |  |  |  |  | 6.625% |  |  |  |  |
File Period After Closing of Offering |  |  |  |  | 0 years 0 months 75 days |  |  |  |  |  |  |
Declare Period After Closing of Offering |  |  |  |  | 0 years 0 months 180 days |  |  |  |  |  |  |
Additional Interest |  |  |  |  |  | 0.25% |  |  |  | 1.00% |  |
Notice Period Prior to Redemption |  |  |  |  |  |  |  | 0 years 0 months 60 days |  |  | 0 years 0 months 30 days |
Debt Instrumnet, Redemption Price Calculation Contributor, Percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |
Debt Instrument, Redemption Period, Percentage of Principal Amount Redeemable |  |  |  |  |  |  |  |  | 35.00% |  |  |
Debt Instrumnet, Redemption Price, Percentage |  |  |  | 105.125% |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Remaining After Redemption |  |  |  |  |  |  |  |  |  |  |  | 65.00%
Redemption Period After Closing of Offering |  |  | 0 years 0 months 90 days |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  | $ 5,700,000 |  |  |  |  |  |  |  |

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