Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Subparagraph (SX 210.5-02.19,20)
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
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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
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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Fair Value Measurements - Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Feb. 28, 2018	Dec. 31, 2017	Jan. 31, 2017
Fair Value of Financial Instruments
Less: current portion	$ 433		$ 181
Less: deferred financing costs	35,188		27,997
Long-term Debt, Excluding Current Maturities, Total	$ 3,737,273		4,027,766
6.15% senior notes due February 2018
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	6.15%	6.15%
9.25% senior notes due January 2019
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	9.25%
5.00% senior notes due September 2020
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.00%
4.625% senior notes due September 2021
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	4.625%
5.50% senior notes due January 2023
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.50%
5.10% senior notes due September 2023
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.10%
0.75% senior exchangeable notes due January 2024
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	0.75%
Less: deferred financing costs				$ 9,600
5.75% senior notes due February 2025
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.75%
Commercial paper
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)		5.75%
Fair Value
Fair Value of Financial Instruments
Debt	$ 3,724,344		4,024,277
Fair Value \| 6.15% senior notes due February 2018
Fair Value of Financial Instruments
Debt			462,674
Fair Value \| 9.25% senior notes due January 2019
Fair Value of Financial Instruments
Debt			321,028
Fair Value \| 5.00% senior notes due September 2020
Fair Value of Financial Instruments
Debt	676,642		670,757
Fair Value \| 4.625% senior notes due September 2021
Fair Value of Financial Instruments
Debt	688,022		665,003
Fair Value \| 5.50% senior notes due January 2023
Fair Value of Financial Instruments
Debt	592,500		584,850
Fair Value \| 5.10% senior notes due September 2023
Fair Value of Financial Instruments
Debt	331,443		325,844
Fair Value \| 0.75% senior exchangeable notes due January 2024
Fair Value of Financial Instruments
Debt	450,800		443,940
Fair Value \| 5.75% senior notes due February 2025
Fair Value of Financial Instruments
Debt	769,504
Fair Value \| Revolving Credit Facility
Fair Value of Financial Instruments
Debt	215,000		510,000
Fair Value \| Commercial paper
Fair Value of Financial Instruments
Debt			40,000
Fair Value \| Other
Fair Value of Financial Instruments
Debt	433		181
Carrying Value
Fair Value of Financial Instruments
Debt	3,772,894		4,055,944
Less: current portion	433		181
Less: deferred financing costs	35,188		27,997
Long-term Debt, Excluding Current Maturities, Total	3,737,273		4,027,766
Carrying Value \| 6.15% senior notes due February 2018
Fair Value of Financial Instruments
Debt			460,762
Carrying Value \| 9.25% senior notes due January 2019
Fair Value of Financial Instruments
Debt			303,489
Carrying Value \| 5.00% senior notes due September 2020
Fair Value of Financial Instruments
Debt	670,075		669,846
Carrying Value \| 4.625% senior notes due September 2021
Fair Value of Financial Instruments
Debt	$ 695,288		695,108
Carrying Value \| 5.50% senior notes due January 2023
Fair Value of Financial Instruments
Interest rate on senior notes due (as a percent)	5.50%
Debt	$ 600,000		600,000
Carrying Value \| 5.10% senior notes due September 2023
Fair Value of Financial Instruments
Debt	346,672		346,576
Carrying Value \| 0.75% senior exchangeable notes due January 2024
Fair Value of Financial Instruments
Debt	445,426		429,982
Carrying Value \| 5.75% senior notes due February 2025
Fair Value of Financial Instruments
Debt	800,000
Carrying Value \| Revolving Credit Facility
Fair Value of Financial Instruments
Debt	215,000		510,000
Carrying Value \| Commercial paper
Fair Value of Financial Instruments
Debt			40,000
Carrying Value \| Other
Fair Value of Financial Instruments
Debt	$ 433		$ 181