Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal amount	$ 3,611,273	$ 3,866,317
Less: unamortized costs, net	35,131	35,982
Total debt	3,576,142	3,830,335
Less: current portion long-term debt	327,429	271,057
Long-term debt	$ 3,248,713	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	4.125%
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	645,000	650,000
Other debt
Debt Instrument [Line Items]
Principal amount	$ 5,432	$ 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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