Debt Facilities - Senior Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long term debt, gross	$ 1,344,241	$ 1,388,524
Add amount representing unamortized debt premium	1,830	1,882
Total long term debt	9,672,271
Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt, gross	8,326,200	8,500,125
Less amount representing unamortized debt issuance cost	(68,936)	(75,372)
Add amount representing unamortized debt premium	3,132	5,031
Total long term debt	8,260,396	8,429,784
Less current portion	(300,929)	(300,999)
Total	$ 7,959,467	8,128,785
Senior Notes [Member] \| 5.000% Infomart Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.00%
Long term debt, gross	$ 600,000	$ 750,000
Effective interest rate	4.43%	4.40%
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 750,000	$ 750,000
Effective interest rate	5.56%	5.56%
Senior Notes [Member] \| 5.375% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 1,000,000	$ 1,000,000
Effective interest rate	5.51%	5.51%
Senior Notes [Member] \| 2.875% Euro Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	2.875%
Long term debt, gross	$ 852,600	$ 859,125
Effective interest rate	3.08%	3.08%
Senior Notes [Member] \| 5.750% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.75%
Long term debt, gross	$ 500,000	$ 500,000
Effective interest rate	5.88%	5.88%
Senior Notes [Member] \| 2.875% Euro Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	2.875%
Long term debt, gross	$ 1,136,800	$ 1,145,500
Effective interest rate	3.04%	3.04%
Senior Notes [Member] \| 5.875% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.875%
Long term debt, gross	$ 1,100,000	$ 1,100,000
Effective interest rate	6.03%	6.03%
Senior Notes [Member] \| 2.875% Euro Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	2.875%
Long term debt, gross	$ 1,136,800	$ 1,145,500
Effective interest rate	3.04%	3.04%
Senior Notes [Member] \| 5.375% Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 1,250,000	$ 1,250,000
Effective interest rate	5.51%	5.51%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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