Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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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
-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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- Definition

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

+ References

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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.

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No definition available.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

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No definition available.

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- Definition

Fixed interest rate related to the interest rate derivative.

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No definition available.

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- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Period Type:	instant

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Additional Periods

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No definition available.

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Data Type:	xbrli:integerItemType
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Debt Instrument, Term, Additional Period

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Balance Type:	na
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Proceeds from Public Offering Sale of Debt

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Balance Type:	debit
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Public offering price as a percent of par.

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SENIOR NOTES PAYABLE AND OTHER DEBT - Narrative (Details) CAD in Thousands, $ in Thousands		1 Months Ended		3 Months Ended
	Apr. 25, 2017 USD ($) period	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)	Apr. 03, 2017 USD ($)	Mar. 31, 2017 CAD	Mar. 31, 2017 USD ($)	Dec. 31, 2016 CAD	Dec. 31, 2016 USD ($)	Sep. 30, 2016 CAD
Debt instruments
Principal amount outstanding							$ 12,020,558		$ 11,190,914
Derivative gain		$ 800
Unsecured revolving credit facilities
Debt instruments
Principal amount outstanding							170,731		146,538
Amount outstanding							170,700
Letters of credit outstanding							14,100
Unused borrowing capacity available							1,800,000
Unsecured Term Loan Due 2018
Debt instruments
Principal amount outstanding							200,000		200,000
Debt instrument, term of loan				4 years
Unsecured term loan due 2019
Debt instruments
Principal amount outstanding							372,042		371,215
Debt instrument, term of loan				5 years
Unsecured term loan due 2020
Debt instruments
Debt instrument, basis spread on variable rate				97.50%
Principal amount outstanding							$ 900,000		900,000
3.100% Senior Notes due 2023
Debt instruments
Principal amount outstanding \| CAD						CAD 400,000		CAD 0
Interest rate						3.10%	3.10%
Public offering price as percent of par						99.28%	99.28%
Proceeds from public offering sale of debt				$ 397,100
3.850% Senior Notes due 2027
Debt instruments
Principal amount outstanding							$ 400,000		$ 0	CAD 400,000
Interest rate						3.85%	3.85%
Public offering price as percent of par										99.196%
Proceeds from public offering sale of debt			$ 396,800
Revolving Credit Facility \| Unsecured revolving credit facilities
Debt instruments
Line of credit facility, maximum borrowing capacity (up to)							$ 2,000,000
Revolving Credit Facility \| Unsecured revolving credit facilities \| LIBOR
Debt instruments
Debt instrument, basis spread on variable rate				1.00%
Revolving Credit Facility \| Unsecured Term Loan Due 2018
Debt instruments
Line of credit facility, maximum borrowing capacity (up to)							200,000
Revolving Credit Facility \| Unsecured Term Loan Due 2018 \| LIBOR
Debt instruments
Debt instrument, basis spread on variable rate				1.05%
Revolving Credit Facility \| Unsecured term loan due 2019
Debt instruments
Principal amount outstanding							372,000
Subsequent Event \| Revolving Credit Facility
Debt instruments
Additional periods \| period	2
Debt instrument, additional period	6 months
Subsequent Event \| Revolving Credit Facility \| LIBOR
Debt instruments
Debt instrument, basis spread on variable rate	0.875%
Subsequent Event \| Revolving Credit Facility \| Unsecured revolving credit facilities
Debt instruments
Line of credit facility, maximum borrowing capacity (up to)	$ 3,000,000
Subsequent Event \| Revolving Credit Facility \| Accordion Feature
Debt instruments
Line of credit facility, maximum borrowing capacity (up to)	$ 3,750,000
Forward Contracts \| Subsequent Event
Debt instruments
Derivative notional amount					$ 275,000
Debt, weighted average interest rate					2.33%
Interest Rate Swap
Debt instruments
Derivative notional amount							$ 400,000
Derivative fixed interest rate						3.10%	3.10%
Interest Rate Swap \| LIBOR
Debt instruments
Debt, weighted average interest rate						0.98%	0.98%