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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Total long-term debt	$ 2,127,361,000		$ 2,127,361,000		$ 2,302,584,000
Less: deferred financing costs related to senior unsecured notes	(31,036,000)		(31,036,000)		(35,416,000)
Senior Unsecured Debt [Member] | 7.25% senior unsecured notes due February 1, 2019 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 399,000,000		$ 399,000,000		400,000,000
Stated interest rate (as percent)	7.25%		7.25%
Senior Unsecured Debt [Member] | 6.5% senior unsecured notes due November 1, 2021 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 397,697,000		$ 397,697,000		400,000,000
Stated interest rate (as percent)	6.50%		6.50%
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due March 15, 2022 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 940,500,000		$ 940,500,000		1,000,000,000
Stated interest rate (as percent)	6.875%		6.875%
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due January 15, 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 386,200,000		$ 386,200,000		400,000,000
Stated interest rate (as percent)	6.875%		6.875%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Write-off of deferred financing costs		$ 0
Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Write-off of deferred financing costs	$ 0		$ 1,800,000	$ 500,000
Total long-term debt	$ 35,000,000		$ 35,000,000		$ 138,000,000

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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