Area of a real estate property.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
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- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
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- Definition

The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
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-Topic 810
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-Section 45
-Paragraph 15
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- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands, ft² in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) ft²	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items]
Square footage of operating properties (in square feet) \| ft²	34.6
Accumulated other comprehensive loss	$ 1,760,434	$ 1,906,343	$ 1,750,699	$ 1,809,842
Rentals, net	119,826	129,148
Other	3,312	3,304
Accounting Standards Update 2016-02 [Member]
Significant Accounting Policies [Line Items]
Rentals, net	400
Other	$ (400)
Revenue Benchmark [Member] \| Tenant Base [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	2.50%
Revenue Benchmark [Member] \| Houston, Texas Geographic Concentration [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	20.20%
Revenue Benchmark [Member] \| Other Parts of Texas Geographic Concentration [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	9.00%
FLORIDA \| Revenue Benchmark [Member] \| Geographic Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	19.40%
CALIFORNIA \| Revenue Benchmark [Member] \| Geographic Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	18.40%
Gain on Cash Flow Hedges [Member]
Significant Accounting Policies [Line Items]
Accumulated other comprehensive loss	$ 4,282	$ 5,170	$ 4,501	$ 7,424
Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Significant Accounting Policies [Line Items]
Cash flow hedge gain (loss) to be amortized within 12 months	$ 900