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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2016
Debt Instrument [Line Items]
Total long-term debt	$ 2,696,533	$ 2,097,606
Line of Credit [Member] | Revolving Credit Facility [Member] | Senior Secured Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	626,000	70,000
Line of Credit [Member] | Revolving Credit Facility [Member] | OMP Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	117,000	78,000
Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	2,052,950	2,052,950
Less: unamortized deferred financing costs on senior unsecured notes	$ (21,646)	(22,956)
Senior Unsecured Debt [Member] | 7.25% senior unsecured notes due February 1, 2019 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)	7.25%
Total principal of senior unsecured notes and revolving line of credit	$ 54,275	54,275
Senior Unsecured Debt [Member] | 6.5% senior unsecured notes due November 1, 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.50%
Total principal of senior unsecured notes and revolving line of credit	$ 395,501	395,501
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due March 15, 2022 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%
Total principal of senior unsecured notes and revolving line of credit	$ 937,080	937,080
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due January 15, 2023 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%
Total principal of senior unsecured notes and revolving line of credit	$ 366,094	366,094
Senior Unsecured Debt [Member] | 2.625% senior convertible notes due September 15, 2023 [Member]
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.625%
Total principal of senior unsecured notes and revolving line of credit	$ 300,000	300,000
Less: unamortized debt discount on senior unsecured convertible notes	$ (77,771)	$ (80,388)	$ (93,200)

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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