Annual report pursuant to Section 13 and 15(d)

Fair Value of Financial Instruments (Details)

v3.19.3.a.u2
Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Deferred finance costs $ 23,751 $ 30,733
Senior notes | 6.625% Senior Notes Due 2023    
Debt Instrument [Line Items]    
Deferred finance costs 3,300  
Senior notes | 6.000% Senior Notes Due 2024    
Debt Instrument [Line Items]    
Deferred finance costs 6,900  
Senior notes | 6.375% Senior Notes Due 2025    
Debt Instrument [Line Items]    
Deferred finance costs 9,600  
Senior notes | 6.375% Senior Notes Due 2026    
Debt Instrument [Line Items]    
Deferred finance costs 3,900  
Carrying value | Senior notes    
Debt Instrument [Line Items]    
Fair value of notes 1,800,000  
Fair value | Senior notes    
Debt Instrument [Line Items]    
Fair value of notes $ 1,300,000