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Debt (Details 3) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 2 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
note
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Interest rate cap contracts
Dec. 31, 2013
Interest rate cap contracts
Mar. 31, 2014
Senior notes 5.875% due 2022
Dec. 31, 2013
Senior notes 5.875% due 2022
Oct. 19, 2012
Senior notes 5.875% due 2022
Mar. 31, 2014
Senior notes 8.50% due 2020
Dec. 31, 2013
Senior notes 8.50% due 2020
Oct. 18, 2010
Senior notes 8.50% due 2020
Mar. 31, 2014
Senior notes 8.50% due 2020
12-month period commencing November 1, 2015
Mar. 31, 2014
Senior notes 8.50% due 2020
12-month period commencing November 1, 2016
Mar. 31, 2014
Senior notes 8.50% due 2020
12-month period commencing November 1, 2017
Mar. 31, 2014
Senior notes 8.50% due 2020
12-month period commencing November 1, 2018 and thereafter
Feb. 18, 2014
Senior Notes 9.50% due 2018
Mar. 31, 2014
Senior Notes 9.50% due 2018
Mar. 31, 2010
Senior Notes 9.50% due 2018
Dec. 31, 2013
Senior Notes 9.50% due 2018
Feb. 03, 2010
Senior Notes 9.50% due 2018
Mar. 31, 2014
Other
Dec. 31, 2013
Other
Mar. 31, 2014
Senior Notes, Due 2022 [Member]
12-month period commencing October 15, 2017
Mar. 31, 2014
Senior Notes, Due 2022 [Member]
12-month period commencing October 15,2018
Mar. 31, 2014
Senior Notes, Due 2022 [Member]
12-month period commencing October 15,2019
Mar. 31, 2014
Senior Notes, Due 2022 [Member]
12-month period commencing October 15,2020 and thereafter
Mar. 31, 2014
Fair Value Hedging [Member]
Senior Notes, Due 2020 [Member]
Mar. 31, 2014
Fair Value Hedging [Member]
Senior Notes, Due 2022 [Member]
Debt:                                                        
Number of Senior Notes outstanding 2                                                      
Interest rate, stated percentage (as a percent)               5.875%     8.50%                 9.50%                
Proceeds from long-term debt $ 580,600,000 $ 9,100,000                               $ 392,000,000                    
Face amount of debt               300,000,000     600,000,000                 400,000,000                
Event of default, minimum percentage of Senior Notes held required to declare debt due and payable (as a percent) 25.00%                                                      
Debt Instrument, Redemption Price, Percentage                       104.25% 102.833% 101.417% 100.00% 104.75%             102.938% 101.958% 100.979% 100.00%    
Maximum percentage of the principal amount of the debt instrument which the entity may redeem with proceeds from qualified equity offerings (as a percent)           35.00%                                            
Redemption price of debt instrument if redeemed with proceeds from qualified equity offerings (as a percent)           105.875%                                            
Minimum percentage of the principal amount of the debt instrument which must remain outstanding after the entity has redeemed a portion of the debt instrument with proceeds from qualified equity offerings (as a percent)           65.00%                                            
Maximum redemption period for the entity to redeem the debt instrument following the receipt of proceeds from qualified equity offerings (in number of days)           90 days                                            
Debt Instrument, Price Percentage on Notes that are Required to be Offered for Repurchase           101.00%                                            
Repayments of Long-term Debt including Redemption Premium                               419,000,000                        
Loss on debt extinguishment (25,300,000) (400,000)                             23,300,000                      
Debt redemption premium                                 19,000,000                      
Write off of Deferred Debt Issuance Cost                                 4,300,000                      
Amortization of Debt Discount (Premium)                                 8,300,000                      
Carrying amount 1,845,500,000   1,526,800,000     291,700,000 289,100,000   614,900,000 614,800,000             0   408,400,000   74,900,000 52,000,000            
Weighted average interest rate (as a percent)                                         6.40%              
Derivative, Notional Amount       $ 100,000,000 $ 100,000,000                                           $ 75,000,000 $ 125,000,000
Cap on interest rate (as a percent)       3.00%                                                
Derivative, Description of Variable Rate Basis       LIBOR                                                
Derivative, Fixed Interest Rate                                                     8.31% 5.18%