This element represents weighted average maturity of debt.

No definition available.

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- Definition

The portion of the outstanding balance of the line of credit that is denominated in a foreign currency.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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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.

+ Details

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Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount (premium).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 4
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Balance Type:	debit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

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
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+ Details

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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Balance Type:	credit
Period Type:	instant

- Definition

The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Period Type:	instant

- Details

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Debt - Schedule of Debt Maturities (Details) $ in Thousands, £ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 GBP (£)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Long-term debt, gross	$ 7,834,317
(Discounts), premiums and debt costs, net	(48,016)
Long-term debt	7,786,301
Other debt	94,165		$ 92,385
Debt maturing in 2018
Debt Instrument [Line Items]
2018	3,512
Debt maturing in 2019
Debt Instrument [Line Items]
2019	682,374
Debt maturing in 2020
Debt Instrument [Line Items]
2020	803,758
Debt maturing in 2021
Debt Instrument [Line Items]
2021	1,728,193
Debt maturing in 2022
Debt Instrument [Line Items]
2022	902,861
Thereafter
Debt Instrument [Line Items]
Thereafter	3,713,619
Bank Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	1,017,076
(Discounts), premiums and debt costs, net	0
Long-term debt	$ 1,017,076
Line of credit, portion denominated in GBP \| £		£ 105
Weighted-average interest rate (as a percent)	2.74%	2.74%
Bank Line of Credit \| Debt maturing in 2018
Debt Instrument [Line Items]
2018	$ 0
Bank Line of Credit \| Debt maturing in 2019
Debt Instrument [Line Items]
2019	0
Bank Line of Credit \| Debt maturing in 2020
Debt Instrument [Line Items]
2020	0
Bank Line of Credit \| Debt maturing in 2021
Debt Instrument [Line Items]
2021	1,017,076
Bank Line of Credit \| Debt maturing in 2022
Debt Instrument [Line Items]
2022	0
Bank Line of Credit \| Thereafter
Debt Instrument [Line Items]
Thereafter	0
Term loans
Debt Instrument [Line Items]
2019 \| £		£ 169
Long-term debt, gross	228,674
(Discounts), premiums and debt costs, net	(386)
Long-term debt	228,288
Term loans \| Debt maturing in 2018
Debt Instrument [Line Items]
2018	0
Term loans \| Debt maturing in 2019
Debt Instrument [Line Items]
2019	228,674
Term loans \| Debt maturing in 2020
Debt Instrument [Line Items]
2020	0
Term loans \| Debt maturing in 2021
Debt Instrument [Line Items]
2021	0
Term loans \| Debt maturing in 2022
Debt Instrument [Line Items]
2022	0
Term loans \| Thereafter
Debt Instrument [Line Items]
Thereafter	$ 0
Unsecured Debt
Debt Instrument [Line Items]
Interest rate (as a percent)
Long-term debt, gross	$ 6,450,000
(Discounts), premiums and debt costs, net	(53,549)
Long-term debt	$ 6,396,451
Weighted-average interest rate (as a percent)	4.19%	4.19%
Weighted-average maturity	6 years
Unsecured Debt \| Minimum
Debt Instrument [Line Items]
Interest rate (as a percent)	2.79%	2.79%
Unsecured Debt \| Maximum
Debt Instrument [Line Items]
Interest rate (as a percent)	6.88%	6.88%
Unsecured Debt \| Debt maturing in 2018
Debt Instrument [Line Items]
Interest rate (as a percent)	0.00%	0.00%
2018	$ 0
Unsecured Debt \| Debt maturing in 2019
Debt Instrument [Line Items]
Interest rate (as a percent)	3.95%	3.95%
2019	$ 450,000
Unsecured Debt \| Debt maturing in 2020
Debt Instrument [Line Items]
Interest rate (as a percent)	2.79%	2.79%
2020	$ 800,000
Unsecured Debt \| Debt maturing in 2021
Debt Instrument [Line Items]
Interest rate (as a percent)	5.49%	5.49%
2021	$ 700,000
Unsecured Debt \| Debt maturing in 2022
Debt Instrument [Line Items]
Interest rate (as a percent)	3.93%	3.93%
2022	$ 900,000
Unsecured Debt \| Thereafter
Debt Instrument [Line Items]
Interest rate (as a percent)	4.36%	4.36%
Thereafter	$ 3,600,000
Mortgage Debt
Debt Instrument [Line Items]
Interest rate (as a percent)
Long-term debt, gross	$ 138,567
(Discounts), premiums and debt costs, net	5,919
Long-term debt	$ 144,486
Weighted-average interest rate (as a percent)	4.19%	4.19%
Weighted-average maturity	20 years
Mortgage Debt \| Minimum
Debt Instrument [Line Items]
Interest rate (as a percent)	2.08%	2.08%
Mortgage Debt \| Maximum
Debt Instrument [Line Items]
Interest rate (as a percent)	5.91%	5.91%
Mortgage Debt \| Debt maturing in 2018
Debt Instrument [Line Items]
Interest rate (as a percent)	0.00%	0.00%
2018	$ 3,512
Mortgage Debt \| Debt maturing in 2019
Debt Instrument [Line Items]
Interest rate (as a percent)	0.00%	0.00%
2019	$ 3,700
Mortgage Debt \| Debt maturing in 2020
Debt Instrument [Line Items]
Interest rate (as a percent)	5.08%	5.08%
2020	$ 3,758
Mortgage Debt \| Debt maturing in 2021
Debt Instrument [Line Items]
Interest rate (as a percent)	5.26%	5.26%
2021	$ 11,117
Mortgage Debt \| Debt maturing in 2022
Debt Instrument [Line Items]
Interest rate (as a percent)	0.00%	0.00%
2022	$ 2,861
Mortgage Debt \| Thereafter
Debt Instrument [Line Items]
Interest rate (as a percent)	4.09%	4.09%
Thereafter	$ 113,619
Life Care Bonds and Demand Notes
Debt Instrument [Line Items]
Other debt	94,000
Life Care Bonds
Debt Instrument [Line Items]
Other debt	$ 61,000
On-Demand Note
Debt Instrument [Line Items]
Interest rate (as a percent)	3.60%	3.60%
Other debt	$ 33,000