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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

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- 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 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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