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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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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Amount, after accumulated amortization, of debt discount.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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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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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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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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LONG-TERM DEBT SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 14, 2017	Dec. 31, 2016	Dec. 14, 2016	Sep. 14, 2016
Debt Instrument [Line Items]
Total senior notes	$ 1,151,932		$ 1,043,954
Total debt, net of discount and unamortized debt issuance costs	1,151,932		1,043,954
Less current portion of long-term debt	0		0
Long-term debt	1,151,932		1,043,954
1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Principal amount	(200,000)		(200,000)
Unamortized Discount	30,328		37,475
Unamortized Debt Issuance Costs	(3,615)		(4,584)	$ (4,800)
Convertible Debt	166,057		157,941
6.125% Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	(6,570)		(7,544)		$ (7,800)
Principal amount	(400,000)		(400,000)
Senior Long Term Notes	393,430		392,456
5.75% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Principal amount	(600,000)		0
Unamortized Debt Issuance Costs	(7,555)		0
Convertible Debt	592,445		0
7.75% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Costs	0	$ (5,400)	(6,443)
Principal amount	0		(500,000)
Senior Long Term Notes	0		493,557
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 0		$ 0