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Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Nov. 14, 2017
Sep. 14, 2016
Debt Instrument        
Document Period End Date Mar. 31, 2020      
Total senior notes $ 1,279,324 $ 1,173,226    
Long-term debt 1,896,324 1,177,226    
1.125% Convertible Senior Notes due 2021 [Member]        
Debt Instrument        
Principal amount 200,000 200,000    
Unamortized Discount (12,691) (14,763)    
Unamortized Debt Issuance Expense 1,422 1,666   $ 4,800
Convertible Debt 185,887 183,571    
6.125% Senior Notes due 2024 [Member]        
Debt Instrument        
Unamortized Debt Issuance Expense 4,366 4,611   $ 7,800
Senior Notes, Noncurrent 395,634 395,389    
Principal amount 400,000 400,000    
6.25% Senior Notes due 2025 [Member]        
Debt Instrument        
Unamortized Debt Issuance Expense 990 0    
Senior Notes, Noncurrent 103,314 0    
Principal amount 102,324 0    
5.75% Senior Notes due 2026 [Member]        
Debt Instrument        
Unamortized Debt Issuance Expense 5,511 5,734 $ 7,600  
Senior Notes, Noncurrent 594,489 594,266    
Principal amount   600,000    
Revolving Credit Facility        
Debt Instrument        
Revolving credit facility 617,000 $ 4,000    
5.75% Senior Notes due 2026 [Member]        
Debt Instrument        
Principal amount $ 600,000