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Indebtedness - Schedule of Outstanding Debts (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Face Amount | $ 1,750,000 | $ 1,750,000
Unamortized Discount | $ 3,159 | 4,047
Senior unsecured notes due 2019 |  |
Debt Instrument [Line Items] |  |
Coupon | 3.25% |
Face Amount | $ 400,000 | 400,000
Unamortized Discount | $ 78 | 138
Senior unsecured notes due 2020 |  |
Debt Instrument [Line Items] |  |
Coupon | 6.75% |
Face Amount | $ 200,000 | 200,000
Unamortized Discount | $ 488 | 703
Unsecured senior notes due 2021 |  |
Debt Instrument [Line Items] |  |
Coupon | 6.75% |
Face Amount | $ 300,000 | 300,000
Unamortized Discount | $ 2,093 | 2,627
Senior unsecured notes due 2024 |  |
Debt Instrument [Line Items] |  |
Coupon | 4.75% |
Face Amount | $ 250,000 | 250,000
Unamortized Discount | $ 500 | 579
Senior unsecured notes due in 2042 |  |
Debt Instrument [Line Items] |  |
Coupon | 5.625% |
Face Amount | $ 350,000 | 350,000
Unamortized Discount | $ 0 | 0
Senior unsecured notes due in 2046 |  |
Debt Instrument [Line Items] |  |
Coupon | 6.25% |
Face Amount | $ 250,000 | 250,000
Unamortized Discount | $ 0 | $ 0

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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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