Long-Term Debt (Fair Value and Carrying Value of Debt Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Less current portion of long term debt and commercial paper	$ 1,382,738	$ 2,003,003
Long-term debt, less current portion	2,511,485
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital leases and other	11,643	16,805
Unamortized debt issuance costs	(7,117)	(7,964)
Total debt	2,556,967	3,184,852
Less current portion of long term debt and commercial paper	1,382,738	2,003,578
Long-term debt, less current portion	1,174,229	1,181,274
Fair Value \| Securitization facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securitization facility	500,000	500,000
Fair Value \| 3.85% senior notes, payable February 1, 2023; interest payable semiannually
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	615,006	584,730
Fair Value \| 6.125% notes, payable January 15, 2016; interest payable semiannually
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	0	646,130
Fair Value \| 2.00% senior notes, payable January 14, 2022; interest payable annually
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	556,460	554,209
Fair Value \| Senior secured credit facility due July 8 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	536,503	472,067
Fair Value \| Five-year senior secured credit facility, due March 26, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	60,672	134,075
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital leases and other	11,643	16,807
Unamortized debt issuance costs	(7,117)	(7,964)
Total debt	2,511,485	3,191,967
Less current portion of long term debt and commercial paper	1,382,738	2,003,003
Long-term debt, less current portion	1,128,747	1,188,964
Carrying Value \| Securitization facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securitization facility	500,000	500,000
Carrying Value \| 3.85% senior notes, payable February 1, 2023; interest payable semiannually
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	600,000	600,000
Carrying Value \| 6.125% notes, payable January 15, 2016; interest payable semiannually
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	0	645,555
Carrying Value \| 2.00% senior notes, payable January 14, 2022; interest payable annually
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	525,984	546,627
Carrying Value \| Senior secured credit facility due July 8 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	536,503	472,067
Carrying Value \| Five-year senior secured credit facility, due March 26, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	60,672	134,075
United States \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. commercial paper	283,800	284,800
United States \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. commercial paper	$ 283,800	$ 284,800

Capital Leases And Other, Fair Value

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- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

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(19)(a)(3))
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-Name Accounting Standards Codification
-Topic 944
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-Section S99
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Line-of-Credit Arrangement
-URI http://asc.fasb.org/extlink&oid=6517033

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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

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-Name Accounting Standards Codification
-Topic 942
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

Fair value portion of notes payable.

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