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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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Nov. 14, 2017	Sep. 14, 2016
Debt Instrument
Debt, Long-term and Short-term, Combined Amount	$ 1,437,559	$ 1,602,562
Long-term Debt, Current Maturities	195,451	193,014
Long-term debt	1,242,108	1,409,548
Total senior notes	1,437,559	1,434,562
1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Principal amount	200,000	200,000
Unamortized Discount	(4,102)	(6,295)
Unamortized Debt Issuance Expense	447	691
Convertible Debt	195,451	193,014
6.125% Senior Notes due 2024 [Member]
Debt Instrument
Unamortized Debt Issuance Expense	3,387	3,632		$ 7,800
Senior Notes, Noncurrent	396,613	396,368
Principal amount	400,000	400,000
6.25% Senior Notes due 2025 [Member]
Debt Instrument
Unamortized Debt Issuance Expense	837	(880)
Senior Notes, Noncurrent	103,161	103,204
Principal amount	102,324	102,324
5.75% Senior Notes due 2026 [Member]
Debt Instrument
Unamortized Discount	(1,368)	(1,429)
Unamortized Debt Issuance Expense	6,298	6,595	$ 7,600
Senior Notes, Noncurrent	742,334	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