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Long-Term Debt - Interest Rates (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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1.875% Senior Notes |  |
Debt Instrument [Line Items] |  |
Unamortized discount and debt issuance costs | $ 2,355 | $ 2,841
Debt instrument, interest rate | 1.875% | 1.875%
4.15% Senior Notes |  |
Debt Instrument [Line Items] |  |
Unamortized discount and debt issuance costs | $ 2,641 | $ 2,884
Debt instrument, interest rate | 4.15% | 4.15%
4.50% Senior Notes |  |
Debt Instrument [Line Items] |  |
Unamortized discount and debt issuance costs | $ 439 | $ 589
Debt instrument, interest rate | 4.50% | 4.50%
5.45% Senior Notes |  |
Debt Instrument [Line Items] |  |
Unamortized discount and debt issuance costs | $ 3,927 | $ 4,004
Debt instrument, interest rate | 5.45% | 5.45%

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