Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal amount	$ 3,606,219	$ 3,866,317
Less: unamortized costs, net	33,410	35,982
Total debt	3,572,809	3,830,335
Less: current portion long-term debt	334,999	271,057
Long-term debt	$ 3,237,810	3,559,278
Notes due \| Notes due March 2018
Debt Instrument [Line Items]
Interest rate	5.60%
Principal amount	$ 0	250,000
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
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	4.375%
Principal amount	$ 400,000	400,000
Notes due \| Notes due April 2023
Debt Instrument [Line Items]
Interest rate	4.70%
Principal amount	$ 400,000	400,000
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	35,841
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	640,000	650,000
Other debt
Debt Instrument [Line Items]
Principal amount	$ 5,378	$ 5,476

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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