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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