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Debt (6.625% Senior Notes) (Details) (USD $) | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Jan. 01, 2012 | Aug. 31, 2010 | Dec. 31, 2012 6.625% Senior Notes | Feb. 10, 2011 Senior Notes 6.625% Senior Notes | Dec. 31, 2013 Senior Notes 6.625% Senior Notes | Mar. 19, 2013 Senior Notes 6.625% Senior Notes | Dec. 31, 2013 Redemption, Period 2016 Senior Notes 6.625% Senior Notes | Dec. 31, 2013 Redemption, Period 2017 Senior Notes 6.625% Senior Notes | Dec. 31, 2013 Redemption, Period 2018 Senior Notes 6.625% Senior Notes | Dec. 31, 2013 Redemption, Period 2019 and Thereafter Senior Notes 6.625% Senior Notes | Dec. 31, 2013 Minimum Senior Notes 6.625% Senior Notes | Dec. 31, 2013 Maximum Senior Notes 6.625% Senior Notes
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 8.47% |  | 6.625% | 6.625% | 6.625% |  |  |  |  |  |
Redemption period after closing of offering |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |
Debt Instrument, Notice Period Prior to Redemption |  |  |  |  |  |  |  |  |  |  |  |  | 30 days | 60 days
Debt Covenant, Asset Proceeds, Excess Proceeds |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |
Debt Instrument, Redemption Period, Change in Control, Percentage of Principal Amount Redeemable |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |
Debt Instrument, Redemption Price Including Accrued Interest And Liquidated Damages, Percentage |  |  |  |  |  |  | 106.625% |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Remaining After Redemption |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |
Redemption period, principal amount redeemable |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |
Proceeds from long term debt | 1,238,000,000 | 358,000,000 | 835,395,000 |  |  | 293,300,000 |  |  |  |  |  |  |  |
Borrowing under amended senior credit facility |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  |  | 100.00% |  | 103.313% | 102.208% | 101.104% | 100.00% |  |

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