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Debt - Senior Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 12, 2017
Oct. 18, 2016
May 24, 2016
Apr. 06, 2016
Apr. 04, 2016
Sep. 24, 2015
Debt Instrument [Line Items]                      
Loss on extinguishment of debt $ 47,200,000 $ 0 $ 0 $ 47,200,000 $ 0            
2026 Senior Notes                      
Debt Instrument [Line Items]                      
Senior notes, noncurrent     $ 600,000,000.0 $ 600,000,000       $ 600,000,000.0      
Stated percentage     5.50% 5.50%       5.50%      
Percentage of principal amount that may be redeemed     105.50%                
Minimum percentage of notes not eligible for early redemption     65.00%                
Senior notes, percent exchanged             100.00%        
Deferred financing costs       $ 3,100,000              
Debt instrument amortization period deferred financing costs (in years       10 years              
Loss on extinguishment of debt       $ 5,900,000              
2026 Senior Notes | Any time on or after June 15, 2021                      
Debt Instrument [Line Items]                      
Redemption price, percentage     102.75%                
2026 Senior Notes | Beginning on June 15, 2024                      
Debt Instrument [Line Items]                      
Redemption price, percentage     100.00%                
2026 Senior Notes | Any time prior to June 15, 2021 with a 'make-whole' premium and accrued and unpaid interest, if any                      
Debt Instrument [Line Items]                      
Percentage of redemption on notes     100.00%                
2026 Senior Notes | Any time prior to June 15, 2019 with the net cash proceeds from certain equity offerings plus accrued and unpaid interest, if any                      
Debt Instrument [Line Items]                      
Percentage of redemption on notes     35.00%                
Securitized debt                      
Debt Instrument [Line Items]                      
Senior notes, noncurrent     $ 375,000,000.0 375,000,000              
Stated percentage     6.875%                
Loss on extinguishment of debt     $ 23,600,000                
Write-off of deferred financing costs $ 4,800,000                    
2023 Senior Notes                      
Debt Instrument [Line Items]                      
Senior notes, noncurrent     $ 450,000,000.0 $ 450,000,000             $ 450,000,000.0
Stated percentage     5.625% 5.625%             5.625%
Percentage of principal amount that may be redeemed     105.625%                
Minimum percentage of notes not eligible for early redemption     65.00%                
Senior notes, percent exchanged                   100.00%  
2023 Senior Notes | Any time on or after October 15, 2018                      
Debt Instrument [Line Items]                      
Redemption price, percentage     104.219%                
2023 Senior Notes | Beginning on October 15, 2021                      
Debt Instrument [Line Items]                      
Redemption price, percentage     100.00%                
2023 Senior Notes | Any time prior to October 15, 2018 with a 'make-whole' premium and accrued and unpaid interest, if any                      
Debt Instrument [Line Items]                      
Percentage of redemption on notes     100.00%                
2023 Senior Notes | Any time prior to October 15, 2018 with the net cash proceeds from certain equity offerings plus accrued and unpaid interest, if any                      
Debt Instrument [Line Items]                      
Redemption price, percentage     35.00%                
8.0% Sealy Notes                      
Debt Instrument [Line Items]                      
Stated percentage       8.00%              
Credit Facility 2016                      
Debt Instrument [Line Items]                      
Debt instrument amortization period deferred financing costs (in years       5 years              
Loss on extinguishment of debt       $ 1,900,000              
Line of Credit | Credit Facility 2016                      
Debt Instrument [Line Items]                      
Principal borrowing capacity, maximum                 $ 500,000,000.0    
Line of Credit | Delayed Draw Term Loan Facility | Credit Facility 2016                      
Debt Instrument [Line Items]                      
Proceeds from lines of credit       100,000,000.0              
Principal borrowing capacity, maximum                 $ 100,000,000.0    
Revolver                      
Debt Instrument [Line Items]                      
Principal borrowing capacity, maximum           $ 120,000,000.0          
Significant Other Observable Inputs (Level 2) | 2026 Senior Notes                      
Debt Instrument [Line Items]                      
Notes, fair value     $ 618,100,000 606,800,000              
Significant Other Observable Inputs (Level 2) | 2023 Senior Notes                      
Debt Instrument [Line Items]                      
Notes, fair value     $ 470,900,000 $ 468,500,000