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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

X

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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.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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