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Debt, Net - Cabot Senior Secured Notes - Table and Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                
Senior secured notes $ 325,000,000   $ 325,000,000   $ 325,000,000     $ 325,000,000
Debt extinguishment fees     9,000,000.0   9,000,000      
Secured Debt                
Debt Instrument [Line Items]                
Senior secured notes $ 1,106,031,000   $ 1,106,031,000   $ 1,106,031,000     1,111,399,000
Floating rate senior secured notes due 2024 | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate (as a percent) 6.375%   6.375%   6.375%   6.375%  
Debt issued $ 452,000,000.0   $ 452,000,000.0   $ 452,000,000.0   € 400,000,000.0  
Floating rate senior secured notes due 2024 | Secured Debt                
Debt Instrument [Line Items]                
Senior secured notes 454,691,000   454,691,000   454,691,000     0
Floating rate senior secured notes due 2021 | Secured Debt                
Debt Instrument [Line Items]                
Senior secured notes 0   $ 0   $ 0     356,067,000
Extinguishment of debt $ 350,300,000 € 310,000,000.0            
Senior secured notes due 2023 | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate (as a percent) 7.50%   7.50%   7.50%   7.50%  
Senior secured notes due 2023 | Secured Debt                
Debt Instrument [Line Items]                
Senior secured notes $ 651,340,000   $ 651,340,000   $ 651,340,000   € 512,900,000 653,355,000
Stated interest rate (as a percent) 7.50%   7.50%   7.50%   7.50%  
Senior secured notes due 2021 | Secured Debt                
Debt Instrument [Line Items]                
Senior secured notes $ 0   $ 0   $ 0     101,977,000
Stated interest rate (as a percent) 6.50%   6.50%   6.50%   6.50%  
Extinguishment of debt $ 101,600,000 € 80,000,000.0            
Cabot Senior Secured Notes | Senior Notes                
Debt Instrument [Line Items]                
Senior secured notes 1,106,031,000   $ 1,106,031,000   $ 1,106,031,000     1,111,399,000
Total interest expense     23,759,000 $ 21,358,000 47,533,000 $ 42,842,000    
Cabot Senior Secured Notes | Secured Debt                
Debt Instrument [Line Items]                
Senior secured notes $ 1,106,031,000   $ 1,106,031,000   $ 1,106,031,000     $ 1,109,922,000
Euro Interbank Offered Rate (EURIBOR) [Member] | Floating rate senior secured notes due 2024 | Secured Debt                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)         6.375%      
Euro Interbank Offered Rate (EURIBOR) [Member] | Floating rate senior secured notes due 2021 | Secured Debt                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)         5.875%