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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 15, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total long-term debt	$ 2,125,573		$ 2,302,584
Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total long-term debt	195,000		138,000
Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	2,052,950		2,200,000
Less: unamortized deferred financing costs on senior unsecured notes	(29,500)		(35,416)
Senior Unsecured Debt [Member] | 7.25% senior unsecured notes due February 1, 2019 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 54,275		400,000
Stated interest rate (as percent)	7.25%
Senior Unsecured Debt [Member] | 6.5% senior unsecured notes due November 1, 2021 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 395,501		400,000
Stated interest rate (as percent)	6.50%
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due March 15, 2022 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 937,080		1,000,000
Stated interest rate (as percent)	6.875%
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due January 15, 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 366,094		400,000
Stated interest rate (as percent)	6.875%
Senior Unsecured Debt [Member] | 2.625% senior convertible notes due September 15, 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 300,000		0
Less: unamortized debt discount on senior unsecured convertible notes	$ (92,877)	$ (93,200)	$ 0
Stated interest rate (as percent)	2.625%

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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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