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Debt (5.125% Senior Notes) (Details) (USD $) |  |  |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Aug. 31, 2010 | Dec. 31, 2013 Senior Notes 5.125% Senior Notes | Mar. 19, 2013 Senior Notes 5.125% Senior Notes | Dec. 31, 2013 Senior Notes 5.125% Senior Notes Redemption, Period 2018 | Dec. 31, 2013 Senior Notes 5.125% Senior Notes Redemption, Period 2019 | Dec. 31, 2013 Senior Notes 5.125% Senior Notes Redemption, Period 2020 | Dec. 31, 2013 Senior Notes 5.125% Senior Notes Redemption, Period 2021 and Thereafter | Dec. 31, 2013 Senior Notes 5.125% Senior Notes Minimum | Dec. 31, 2013 Senior Notes 5.125% Senior Notes Maximum
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 300,000,000 |  |  |  |  |  |
Stated interest rate |  |  | 8.47% |  | 5.125% |  |  |  |  |  |
Debt Covenant, Asset Proceeds, Excess Proceeds |  |  |  | 25,000,000 |  |  |  |  |  |  |
Debt Covenant, Indenture Agreement, Period After Notice |  |  |  | 60 days |  |  |  |  |  |  |
Debt Instrument, Redemption Period, Change in Control, Percentage of Principal Amount Redeemable |  |  |  | 101.00% |  |  |  |  |  |  |
Redemption period, principal amount redeemable |  |  |  | 35.00% |  |  |  |  |  |  |
Capitalized loan costs | $ 33,100,000 | $ 23,400,000 |  | $ 6,800,000 |  |  |  |  |  |  |
Redemption period after closing of offering |  |  |  | 0 years 0 months 90 days |  |  |  |  |  |  |
Debt Instrument, Notice Period Prior to Redemption |  |  |  |  |  |  |  |  |  | 0 years 0 months 30 days | 0 years 0 months 60 days
Redemption price percentage |  |  |  | 105.125% |  | 102.563% | 101.708% | 100.854% | 100.00% |  |
Debt Instrument, Redemption Price, Percentage of Principal Remaining After Redemption |  |  |  | 65.00% |  |  |  |  |  |  |
Debt Instrument, Redemption Price Calculation Contributor, Percentage |  |  |  | 100.00% |  |  |  |  |  |  |

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