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DEBT OBLIGATIONS, NET - Senior Unsecured Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 25, 2017
Apr. 03, 2017
Apr. 01, 2017
Mar. 16, 2017
Dec. 17, 2014
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 24, 2016
Nov. 05, 2014
Aug. 01, 2014
Sep. 19, 2012
Debt Instrument [Line Items]                          
Gain (loss) on extinguishment/defeasance of debt             $ (4,392,000) $ (73,000) $ 5,382,000        
Senior Unsecured Notes                          
Debt Instrument [Line Items]                          
Unamortized debt issuance costs             (11,210,000)            
Senior Unsecured Notes | Various Date                          
Debt Instrument [Line Items]                          
Unamortized debt issuance costs             (11,200,000) (14,100,000)          
Debt issued             $ 1,166,201,000 1,166,201,000          
Senior Unsecured Notes | Senior Notes Due, 2017                          
Debt Instrument [Line Items]                          
Unamortized debt issuance costs   $ (22,800)           $ (200,000)          
Debt issued                         $ 325,000,000
Stated interest rate on debt instrument (as a percent)                         7.375%
Debt instrument, minimum number of days to give notice for redemption without penalty             30 days            
Debt instrument, maximum number of days to give notice for redemption without penalty             60 days            
Debt instrument, repurchase price amount   297,700,000     $ 5,600,000       21,400,000   $ 325,000,000    
Debt instrument, repurchased face amount   297,700,000     5,400,000       21,900,000        
Gain (loss) on extinguishment/defeasance of debt   $ (53,500)     $ (200,000)       300,000        
Debt instrument, redemption price percentage     100.00%                    
Proceeds from Issuance of Senior Long-term Debt     $ 500,000,000                    
Senior Unsecured Notes | 2021 Notes                          
Debt Instrument [Line Items]                          
Unamortized debt issuance costs                 (400,000)        
Debt issued                 266,201,000     $ 300,000,000  
Stated interest rate on debt instrument (as a percent)                       5.875%  
Debt instrument, minimum number of days to give notice for redemption without penalty           30 days              
Debt instrument, maximum number of days to give notice for redemption without penalty           60 days              
Debt instrument, repurchase price amount                 28,200,000        
Debt instrument, repurchased face amount                 33,800,000        
Gain (loss) on extinguishment/defeasance of debt                 $ 5,100,000        
Debt instrument, authorized repurchase amount                   $ 100,000,000.0      
Senior Unsecured Notes | 2022 Notes                          
Debt Instrument [Line Items]                          
Debt issued       $ 500,000,000                  
Stated interest rate on debt instrument (as a percent)       5.25%                  
Debt instrument, minimum number of days to give notice for redemption without penalty       15 days                  
Debt instrument, maximum number of days to give notice for redemption without penalty       60 days                  
Senior Unsecured Notes | 2025 Notes                          
Debt Instrument [Line Items]                          
Debt issued $ 400,000,000                        
Stated interest rate on debt instrument (as a percent) 5.25%                        
Debt instrument, minimum number of days to give notice for redemption without penalty 15 days                        
Debt instrument, maximum number of days to give notice for redemption without penalty 60 days