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Long-Term Debt - Summary (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 2,900,000 | $ 3,150,000 | $ 2,150,000
Debt issuance costs and debt discount | (28,229) | (26,881) | (15,018)
Long-term debt | 2,871,771 | 3,123,119 | 2,134,982
Less: current portion | 0 | (250,000) | (250,000)
Total long-term debt | 2,871,771 | 2,873,119 | 1,884,982
2010 Senior Notes due October 2020 and October 2040 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 500,000 | 500,000 | 500,000
2011 Senior Notes due November 2041 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 300,000 | 300,000 | 300,000
2013 Senior Notes due March 2018 and March 2023 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 250,000 | 500,000 | 500,000
2014 Senior Notes due May 2019 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 500,000 | 500,000 | 500,000
2016 Senior Notes due August 2021 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 350,000 | 350,000 | 350,000
2017 Senior Notes due December 2025 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 1,000,000 | $ 1,000,000 | $ 0

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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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