Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument
Debt, Long-term and Short-term, Combined Amount	$ 1,440,595	$ 1,602,562
Long-term Debt, Current Maturities	197,919	193,014
Long-term debt	1,242,676	1,409,548
Total senior notes	1,440,595	1,434,562
1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Principal amount	200,000	200,000
Unamortized Discount	(2,081)	(6,986)
Convertible Debt	197,919	193,014
6.125% Senior Notes due 2024 [Member]
Debt Instrument
Unamortized Debt Issuance Expense	3,142	3,632
Senior Notes, Noncurrent	396,858	396,368
Principal amount	400,000	400,000
6.25% Senior Notes due 2025 [Member]
Debt Instrument
Senior Notes, Noncurrent	103,125	103,204
Principal amount	102,324	102,324
Unamortized premium	801	880
5.75% Senior Notes due 2026 [Member]
Debt Instrument
Unamortized Discount	(7,307)	(8,024)
Senior Notes, Noncurrent	742,693	741,976
Principal amount	600,000	750,000
Revolving Credit Facility
Debt Instrument
Revolving credit facility	0	$ 168,000
5.75% Senior Notes due 2026 [Member]
Debt Instrument
Principal amount	$ 750,000

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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