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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 14, 2018 | Oct. 31, 2016 | Aug. 31, 2013
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Total | $ 4,962,594 | $ 3,856,873 |  |  |
Less - current portion | 321,308 | 64,099 |  |  |
Long-term portion | 4,641,286 | 3,792,774 |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 1,226,903 | 338,112 |  |  |
Unamortized discount and debt issuance cost | 2,865 | 3,138 |  |  |
Other Borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 258,147 | 42,246 |  |  |
Floating Rate Notes, due 2021 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 497,096 | 496,796 |  |  |
Unamortized discount and debt issuance cost | 2,904 | 3,204 |  |  |
4.15% Senior Notes, due 2024 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 743,297 | 742,957 |  |  |
Stated interest rate (as a percent) | 4.15% |  | 4.15% |  |
Unamortized discount and debt issuance cost | $ 6,703 | 7,043 |  |  |
4.70% Senior Notes, due 2028 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 1,239,924 | 1,239,657 |  |  |
Stated interest rate (as a percent) | 4.70% |  | 4.70% |  |
Unamortized discount and debt issuance cost | $ 10,076 | 10,343 |  |  |
3.45% Senior Notes, due 2026 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 748,339 | 748,282 |  |  |
Stated interest rate (as a percent) | 3.45% |  |  | 3.45% |
Unamortized discount and debt issuance cost | $ 1,661 | 1,718 |  |  |
4.375% Senior Notes, due 2023 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 248,888 | 248,823 |  |  |
Stated interest rate (as a percent) | 4.375% |  |  |  | 4.375%
Unamortized discount and debt issuance cost | $ 1,113 | $ 1,177 |  |  |

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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