Debt Instrument, Extension Option, Number

No definition available.

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- Definition

Debt Instrument, Extension Option, Term

+ References

No definition available.

+ Details

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- Definition

Represents the weighted average interest rate for borrowings during the period.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
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+ Details

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Period Type:	instant

- Definition

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

+ References

+ Details

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Balance Type:	na
Period Type:	instant

- 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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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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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.

+ References

+ Details

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Period Type:	instant

- Definition

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

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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- Details

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Indebtedness (Details) $ in Thousands				3 Months Ended			9 Months Ended
Indebtedness (Details) $ in Thousands	May 10, 2018 Extension	May 09, 2018	Feb. 02, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Nov. 05, 2018 USD ($)	Dec. 31, 2017 USD ($)
Indebtedness
Unsecured revolving credit facility, outstanding borrowings				$ 143,000			$ 143,000			$ 398,000
Unsecured term loan outstanding				397,143			397,143			399,086
Senior unsecured notes, net				3,596,275			3,596,275			$ 3,203,962
Loss on early extinguishment of debt				0		$ 0	160	$ 0
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses							389,976	$ 598,246
Revolving credit facility and term loan
Indebtedness
Maximum borrowing capacity that may be increased				2,300,000			2,300,000
Revolving credit facility
Indebtedness
Unsecured revolving credit facility, outstanding borrowings				143,000			143,000
Unsecured revolving credit facility, maximum borrowing capacity				$ 1,000,000			$ 1,000,000
Credit facility fee percentage	0.20%
Loss on early extinguishment of debt					$ 90
Annual interest rate				3.09%			3.09%
Weighted average interest rate				2.97%		2.33%	3.00%	2.17%
Remaining borrowing capacity				$ 857,000			$ 857,000
Revolving credit facility \| LIBOR
Indebtedness
Margin over base rate, in basis points (as a percent)		1.10%
Unsecured term loan
Indebtedness
Unsecured term loan outstanding				$ 400,000			$ 400,000
Loss on early extinguishment of debt					$ 70
Annual interest rate				3.20%			3.20%
Weighted average interest rate				3.19%		2.43%	3.02%	2.20%
Unsecured term loan \| LIBOR
Indebtedness
Margin over base rate, in basis points (as a percent)		1.20%
Senior unsecured notes
Indebtedness
Senior unsecured notes, net				$ 3,650,000			$ 3,650,000
Subsequent event \| Revolving credit facility
Indebtedness
Unsecured revolving credit facility, outstanding borrowings									$ 119,000
Remaining borrowing capacity									$ 881,000
Amended Credit Agreement \| Revolving credit facility \| LIBOR
Indebtedness
Margin over base rate, in basis points (as a percent)	1.00%
Debt extension option, number \| Extension	2
Debt extension option, term	6 months
Amended Credit Agreement \| Unsecured term loan \| LIBOR
Indebtedness
Margin over base rate, in basis points (as a percent)	1.10%
Senior Unsecured Notes, due 2030 at 4.375%
Indebtedness
Interest rate, stated percentage				4.375%			4.375%
Senior Unsecured Notes, due 2030 at 4.375% \| Senior unsecured notes
Indebtedness
Issuance of senior notes			$ 400,000
Interest rate, stated percentage			4.375%
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses			$ 386,400