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Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Nov. 14, 2017
Sep. 14, 2016
Debt Instrument        
Document Period End Date Jun. 30, 2020      
Total senior notes $ 1,282,105 $ 1,173,226    
Long-term debt 1,935,105 1,177,226    
1.125% Convertible Senior Notes due 2021 [Member]        
Debt Instrument        
Principal amount 200,000 200,000    
Unamortized Discount (10,589) (14,763)    
Unamortized Debt Issuance Expense 1,178 1,666   $ 4,800
Convertible Debt 188,233 183,571    
6.125% Senior Notes due 2024 [Member]        
Debt Instrument        
Unamortized Debt Issuance Expense 4,121 4,611   $ 7,800
Senior Notes, Noncurrent 395,879 395,389    
Principal amount 400,000 400,000    
6.25% Senior Notes due 2025 [Member]        
Debt Instrument        
Unamortized Debt Issuance Expense 956 0    
Senior Notes, Noncurrent 103,280 0    
Principal amount 102,324 0    
5.75% Senior Notes due 2026 [Member]        
Debt Instrument        
Unamortized Debt Issuance Expense 5,287 5,734 $ 7,600  
Senior Notes, Noncurrent 594,713 594,266    
Principal amount   600,000    
Revolving Credit Facility        
Debt Instrument        
Revolving credit facility 653,000 $ 4,000    
5.75% Senior Notes due 2026 [Member]        
Debt Instrument        
Principal amount $ 600,000