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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments

Long-term debt consisted of the following as of:
 
June 30, 2020
 
December 31, 2019
 
(in thousands)
Senior Notes:
 
 
 
1.125% Convertible Notes due September 2021:
 
 
 
Principal amount
$
200,000

 
$
200,000

Unamortized discount
(10,589
)
 
(14,763
)
Unamortized debt issuance costs
(1,178
)
 
(1,666
)
Net of unamortized discount and debt issuance costs
188,233

 
183,571

 
 
 
 
6.125% Senior Notes due September 2024:
 
 
 
Principal amount
400,000

 
400,000

Unamortized debt issuance costs
(4,121
)
 
(4,611
)
Net of unamortized debt issuance costs
395,879

 
395,389

 
 
 
 
6.25% Senior Notes due December 2025:
 
 
 
Principal amount
102,324

 
—

Unamortized premium
956

 
—

Net of unamortized premium
103,280

 
—

 
 
 
 
5.75% Senior Notes due May 2026:
 
 
 
Principal amount
600,000

 
600,000

Unamortized debt issuance costs
(5,287
)
 
(5,734
)
Net of unamortized debt issuance costs
594,713

 
594,266

 
 
 
 
Total senior notes
1,282,105

 
1,173,226

 
 
 
 
Revolving Credit Facility:
 
 
 
 Revolving credit facility due May 2023
653,000

 
4,000

Total long-term debt, net of unamortized discount and debt issuance costs
$
1,935,105

 
$
1,177,226