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Debt (Long-term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017	May 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Principal amount	$ 3,866,317			$ 3,380,827
Less: unamortized costs, net	35,982			15,937
Total debt	3,830,335			3,364,890
Less: current portion long-term debt	271,057			614,485
Long-term debt	$ 3,559,278			2,750,405
Notes due \| Notes due September 2017
Debt Instrument [Line Items]
Interest rate	5.75%
Principal amount	$ 0			385,109
Notes due \| Notes due March 2018
Debt Instrument [Line Items]
Interest rate	5.60%
Principal amount	$ 250,000			250,000
Notes due \| Notes due May 2018
Debt Instrument [Line Items]
Interest rate	4.75%
Principal amount	$ 0			350,000
Notes due \| Notes due March 2019
Debt Instrument [Line Items]
Interest rate	6.25%
Principal amount	$ 300,000			300,000
Notes due \| Notes due September 2020
Debt Instrument [Line Items]
Interest rate	3.625%
Principal amount	$ 300,000	$ 300,000		0
Notes due \| Notes due October 2021
Debt Instrument [Line Items]
Interest rate	3.625%
Principal amount	$ 600,000			600,000
Notes due \| Notes due May 2022
Debt Instrument [Line Items]
Interest rate	4.125%		3.875%
Principal amount	$ 400,000			0
Notes due \| Notes due April 2023
Debt Instrument [Line Items]
Interest rate	4.70%
Principal amount	$ 400,000	$ 400,000		0
Notes due \| Notes due March 2024
Debt Instrument [Line Items]
Interest rate	4.625%
Principal amount	$ 500,000			500,000
Notes due \| Notes due January 2037
Debt Instrument [Line Items]
Interest rate	5.25%
Principal amount	$ 35,841			115,041
Notes due \| Notes due March 2043
Debt Instrument [Line Items]
Interest rate	6.70%
Principal amount	$ 425,000			425,000
Term loans
Debt Instrument [Line Items]
Principal amount	650,000			450,000
Other debt
Debt Instrument [Line Items]
Principal amount	$ 5,476			$ 5,677