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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt consisted of the following as of the dates indicated:
June 30, 2021December 31, 2020
(in thousands)
Senior Notes:
1.125% Convertible Notes due September 2021:
Principal amount$200,000 $200,000 
Unamortized discount and debt issuance costs(2,081)(6,986)
Net of unamortized discount and debt issuance costs197,919 193,014 
6.125% Senior Notes due September 2024:
Principal amount400,000 400,000 
Unamortized debt issuance costs(3,142)(3,632)
Net of unamortized debt issuance costs396,858 396,368 
6.25% Senior Notes due December 2025:
Principal amount102,324 102,324 
Unamortized premium801 880 
Net of unamortized premium103,125 103,204 
5.75% Senior Notes due May 2026:
Principal amount750,000 750,000 
Unamortized discount and debt issuance costs(7,307)(8,024)
Net of unamortized discount and debt issuance costs742,693 741,976 
Total senior notes1,440,595 1,434,562 
Revolving Credit Facility:
Revolving credit facility due May 2023— 168,000 
Total debt, net of unamortized discount, premium and debt issuance costs1,440,595 1,602,562 
Less current portion of long-term debt197,919 193,014 
Total long-term debt$1,242,676 $1,409,548