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Long-Term Debt Interest Rates (Details) $ in Thousands, € in Millions | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 18, 2014 | Dec. 08, 2014 | Nov. 24, 2014 | Dec. 10, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 0 | $ 778,209 | $ 1,252,302 |  |  |  |
September 2015 Term Loan Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | $ 1,250,000 |  |  |  |
1.875% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  | $ 2,841 | $ 3,971 |  |  |  |  |
Debt instrument, interest rate |  | 1.875% | 1.875% | 1.875% | 1.875% |  | 1.875% | 1.875% |  |
3.00% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  | $ 0 | $ 0 |  |  |  |  |
Debt instrument, interest rate |  | 3.00% | 3.00% | 3.00% | 3.00% |  |  |  | 3.00% |
4.15% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  | $ 2,884 | $ 3,372 |  |  |  |  |
Debt instrument, interest rate |  |  |  | 4.15% | 4.15% |  |  |  | 4.15% |
4.50% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  | $ 589 | $ 891 |  |  |  |  |
Debt instrument, interest rate |  | 4.50% | 4.50% | 4.50% | 4.50% |  |  |  |  | 4.50%
5.45% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  | $ 4,004 | $ 4,159 |  |  |  |  |
Debt instrument, interest rate |  |  |  | 5.45% | 5.45% |  |  |  | 5.45% |
Senior Notes | 1.875% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | € |  |  | € 307.0 |  |  |  |  |  |  |
Senior Notes | 3.00% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | $ 250,000 |  |  |  |  |  |  |  |  |
Senior Notes | 4.50% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 174,700 |  |  |  |  |  |  |  |

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