Identified Intangible Assets and Liabilities - Schedule of Identified Intangible Assets and Intangible Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross amount	$ 125,149	$ 129,552
Accumulated amortization	(97,489)	(98,587)
Total, net	27,660	30,965
Identified intangible liabilities (included in deferred revenue):
Gross amount	293,008	316,119
Accumulated amortization	(249,106)	(262,580)
Total, net	$ 43,902	$ 53,539

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- References

No definition available.

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- Definition

The aggregate sum of gross carrying value of a major finite-lived intangible liabilty class, less accumulated amortization. A major class is composed of intangible liabilities that can be grouped together because they are similar, either by their nature or by their use in the operations of a company

+ References

No definition available.

+ Details

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- Definition

The accumulated amount of amortization of a major finite-lived intangible liability class. A major class is composed of intangible liabilities that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

No definition available.

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- Definition

This element represents the identifiable intangible liability established upon acquisition based on an unfavorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date.

+ References

No definition available.

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- Definition

Identified Intangible Liabilities [Abstract]

+ References

No definition available.

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