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Debt Senior Notes (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 6 Months Ended
Mar. 19, 2013
Jun. 30, 2013
Debt Instrument [Line Items]    
Interest rate   7.75%
Senior Notes Due 2013 | Senior Notes
   
Debt Instrument [Line Items]    
Interest rate   7.75%
Senior Unsecured Notes Due April 2023
   
Debt Instrument [Line Items]    
Redemption Period After Closing of Offering   0 years 0 months 90 days
Senior Unsecured Notes Due April 2023 | Senior Notes
   
Debt Instrument [Line Items]    
Face amount $ 300,000  
Debt Instrument, Maturity Date Apr. 01, 2023  
Interest rate 5.125% 5.125%
Debt Instrument, Redemption Price Calculation Contributor, Percentage 100.00%  
Debt Instrument, Redemption Price, Percentage 105.125%  
Redemption period beginning April 1, 2018   12 months
Registration Rights Agreement [Member]
   
Debt Instrument [Line Items]    
File Period After Closing of Offering 0 years 0 months 75 days  
Declare Period After Closing of Offering 0 years 0 months 180 days  
Registration Rights Agreement [Member] | Senior Notes
   
Debt Instrument [Line Items]    
Additional Interest 0.25%  
Senior Notes Due 2021 | Senior Notes
   
Debt Instrument [Line Items]    
Interest rate   6.625%
Maximum | Senior Unsecured Notes Due April 2023
   
Debt Instrument [Line Items]    
Notice Period Prior to Redemption   0 years 0 months 60 days
Maximum | Senior Unsecured Notes Due April 2023 | Senior Notes
   
Debt Instrument [Line Items]    
Debt Instrument, Redemption Period, Percentage of Principal Amount Redeemable 35.00%  
Maximum | Registration Rights Agreement [Member]
   
Debt Instrument [Line Items]    
Additional Interest 1.00%  
Minimum | Senior Unsecured Notes Due April 2023
   
Debt Instrument [Line Items]    
Notice Period Prior to Redemption   0 years 0 months 30 days
Minimum | Senior Unsecured Notes Due April 2023 | Senior Notes
   
Debt Instrument [Line Items]    
Debt Instrument, Redemption Price, Percentage of Principal Remaining After Redemption 65.00%