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Subsidiary Guarantors - Senior Notes (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Senior Notes [Line Items]    
Carrying value of senior notes $ 550,000 $ 550,000
Covenants for senior credit facilities - amount available under restricted payment basket 84,700  
Event of default for senior notes - failure of other debt payment at maturity in excess of this amount $ 50,000  
Our ownership percentage of subsidiary guarantors of senior notes 100.00%  
Event of default for senior notes - not discharged, bonded or insured judgment in excess of this amount $ 50,000  
Senior Notes Due 2020 [Member]    
Senior Notes [Line Items]    
Carrying value of senior notes $ 300,000 300,000
Interest rate of senior notes 6.625%  
Portion of proceeds from senior notes used to repay outstanding term debt $ 200,000  
Percentage of original aggregate principle amount of senior notes included in repurchase price at change of control 101.00%  
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]    
Carrying value of senior notes $ 250,000 $ 250,000
Interest rate of senior notes 4.75%  
Portion of proceeds from senior notes used to repurchase shares of common stock $ 200,000  
Percentage of original aggregate principle amount of senior notes included in repurchase price at change of control 101.00%  
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%