Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 14, 2016	Dec. 31, 2015
Debt Instrument
Total senior notes	$ 1,041,575		$ 605,377
Total debt, net of discount and unamortized debt issuance costs	1,041,575		642,377
Less current portion of long-term debt	0		112,940
Long-term debt	1,041,575		529,437
3.25% Convertible Senior Notes due 2016 [Member]
Debt Instrument
Principal amount	0		115,000
Unamortized Discount	0		(1,852)
Unamortized Debt Issuance Expense	0		(208)
3.25% Convertible senior notes due 2016, net of discount	0		112,940
1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Principal amount	200,000		0
Unamortized Discount	(39,199)		0
Unamortized Debt Issuance Expense	(4,793)	$ 4,800	0
3.25% Convertible senior notes due 2016, net of discount	156,008		0
7.75% Senior Notes due 2022 [Member]
Debt Instrument
Unamortized Debt Issuance Expense	(6,723)		(7,563)
Principal amount	500,000		500,000
7.75% Senior notes due 2022, net of unamortized debt issuance costs	493,277		492,437
6.125% Senior Notes due 2024 [Member]
Debt Instrument
Unamortized Debt Issuance Expense	(7,710)	$ 7,800	0
Principal amount	400,000		0
7.75% Senior notes due 2022, net of unamortized debt issuance costs	392,290		0
Revolving Credit Facility
Debt Instrument
Revolving credit facility	$ 0		$ 37,000

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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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 amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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