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Subsidiary Guarantors - Senior Notes (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Senior Notes [Line Items]    
Carrying value of senior notes $ 550,000,000 $ 300,000,000
Our ownership percentage of subsidiary guarantors of senior notes 100.00%  
Senior Notes Due 2020 [Member]
   
Senior Notes [Line Items]    
Debt Instrument, Fair Value Disclosure 316,700,000 327,000,000
Carrying value of senior notes 300,000,000 300,000,000
Interest rate of senior notes 6.625%  
Percentage of original aggregate principle amount of senior notes included in repurchase price at change of control 101.00%  
Covenants for senior notes - amount available under restricted payment basket 75,000,000  
Event of default for senior notes - not discharged, bonded or insured judgment in excess of this amount 50,000,000  
Event of default for senior notes - failure of other debt payment at maturity in excess of this amount 50,000,000  
Senior Notes Due 2020 [Member] | Senior Notes, Redemption, Period One [Member]
   
Senior Notes [Line Items]    
Senior notes, redemption price, percentage 103.313%  
Senior Notes Due 2020 [Member] | Senior Notes, Redemption, Period Four [Member]
   
Senior Notes [Line Items]    
Senior notes, redemption price, percentage 100.00%  
Senior Notes Due 2021 [Member]
   
Senior Notes [Line Items]    
Debt Instrument, Fair Value Disclosure 234,700,000  
Carrying value of senior notes 250,000,000  
Interest rate of senior notes 4.75%  
Percentage of original aggregate principle amount of senior notes included in repurchase price at change of control 101.00%  
Covenants for senior notes - amount available under restricted payment basket 75,000,000  
Event of default for senior notes - not discharged, bonded or insured judgment in excess of this amount 50,000,000  
Event of default for senior notes - failure of other debt payment at maturity in excess of this amount $ 50,000,000  
Senior Notes Due 2021 [Member] | Senior Notes, Redemption, Period One [Member]
   
Senior Notes [Line Items]    
Senior notes, redemption price, percentage 103.563%  
Senior Notes Due 2021 [Member] | Senior Notes, Redemption, Period Four [Member]
   
Senior Notes [Line Items]    
Senior notes, redemption price, percentage 100.00%