Debt Instrument, Option to Extend, Number

No definition available.

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Consolidated Secured Indebtedness to Asset Value

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Leverage Ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Ratio of Unsecured Debt to Unencumbered Asset Value

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Minimum Adjusted EBITDA to Consolidated Fixed Charges

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Minimum Net Operating Income to Unsecured Debt

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Minimum Tangible Net Worth

+ References

No definition available.

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- Definition

Line of Credit Facility, Covenant Compliance, Tangible Net Worth. Minimum Percent of Net Equity Proceeds Received

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Extension Fee, Percent of Outstanding Commitments Under Revolving Credit Facility

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Line of Credit Facility, Extension Period

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Higher Borrowing Capacity Option

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

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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.

+ 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- 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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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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Debt - Unsecured Revolving Credit and Term Loan Facility (Details)	1 Months Ended	12 Months Ended
	Aug. 31, 2017 USD ($) option	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Loss on early extinguishment of debt		$ 2,157,000	$ 552,000	$ 1,749,000
Unsecured revolving credit facility		0	0
Revolving Credit Facility [Member] \| Unsecured revolving credit facility [Member]
Debt Instrument [Line Items]
Loss on early extinguishment of debt		2,200,000
Current borrowing capacity	$ 1,100,000,000
Unsecured revolving credit facility		0	0
Option to extend maturity, number \| option	2
Extension period	6 months
Maximum leverage ratio	60.00%
Maximum consolidated secured indebtedness to asset value	40.00%
Minimum tangible net worth	$ 1,200,000,000.0
Tangible net worth, minimum percent of net equity proceeds received	75.00%
Minimum adjusted EBITDA to consolidated fixed charges	1.50
Minimum net operating income to unsecured debt	1.75
Maximum ratio of unsecured debt to unencumbered asset value	60.00%
Revolving Credit Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Current borrowing capacity	$ 265,000,000
Unsecured revolving credit facility	265,000,000	$ 265,000,000	$ 265,000,000
Revolving Credit Facility [Member] \| Unsecured Revolving Credit Facility And Term Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	1,365,000,000.000
Credit facility higher borrowing capacity option	$ 1,750,000,000.00
Minimum [Member] \| Revolving Credit Facility [Member] \| Unsecured revolving credit facility [Member]
Debt Instrument [Line Items]
Extension fee percent of outstanding commitments under revolving credit facility	0.0625%
Maximum [Member] \| Revolving Credit Facility [Member] \| Unsecured revolving credit facility [Member]
Debt Instrument [Line Items]
Extension fee percent of outstanding commitments under revolving credit facility	0.075%