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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 14, 2018 | Oct. 31, 2016 | Aug. 31, 2013
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Total | $ 4,633,181 | $ 3,856,873 |  |  |
Less: current portion | 104,413 | 64,099 |  |  |
Long-term portion | 4,528,768 | 3,792,774 |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 1,113,269 | 338,112 |  |  |
Unamortized discount and debt issuance cost | 2,592 | 3,138 |  |  |
Other Borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 41,339 | 42,246 |  |  |
Floating Rate Notes, due 2021 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 497,396 | 496,796 |  |  |
Unamortized discount and debt issuance cost | 2,604 | 3,204 |  |  |
4.15% Senior Notes, due 2024 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 743,638 | 742,957 |  |  |
Stated interest rate (as a percent) | 4.15% |  | 4.15% |  |
Unamortized discount and debt issuance cost | $ 6,362 | 7,043 |  |  |
4.70% Senior Notes, due 2028 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 1,240,191 | 1,239,657 |  |  |
Stated interest rate (as a percent) | 4.70% |  | 4.70% |  |
Unamortized discount and debt issuance cost | $ 9,809 | 10,343 |  |  |
3.45% Senior Notes, due 2026 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 748,396 | 748,282 |  |  |
Stated interest rate (as a percent) | 3.45% |  |  | 3.45% |
Unamortized discount and debt issuance cost | $ 1,604 | 1,718 |  |  |
4.375% Senior Notes, due 2023 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 248,952 | 248,823 |  |  |
Stated interest rate (as a percent) | 4.375% |  |  |  | 4.375%
Unamortized discount and debt issuance cost | $ 1,048 | $ 1,177 |  |  |

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