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Long-Term Debt - Interest Rates (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
1.875% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized discount and debt issuance costs | $ 3,389 | $ 3,971 |
Debt instrument, interest rate | 1.875% | 1.875% | 1.875%
4.15% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized discount and debt issuance costs | $ 3,128 | $ 3,372 |
Debt instrument, interest rate | 4.15% | 4.15% |
4.50% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized discount and debt issuance costs | $ 740 | $ 891 |
Debt instrument, interest rate | 4.50% | 4.50% | 4.50%
5.45% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized discount and debt issuance costs | $ 4,082 | $ 4,159 |
Debt instrument, interest rate | 5.45% | 5.45% |

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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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