For an unclassified balance sheet, the amount of fees and other revenue, excluding investment income receivable, earned but not yet received, which were recognized in conformity with revenue recognition criteria based on estimates or specific contractual terms.

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Area of a real estate property.

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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.

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity), classified as noncurrent.

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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.

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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.

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Represents the adjustment to revenue related to potentially uncollectible revenues and disputed amounts.

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Significant Accounting Policies [Line Items]

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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands, ft² in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Significant Accounting Policies [Line Items]
Square footage of operating properties (in square feet) \| ft²	31.5
Accumulated other comprehensive loss	$ 1,866,245	$ 1,876,160	$ 1,760,434	$ 1,750,699
Lease concessions or rent forgiveness	0
Allowance for credit loss	$ 0
Revenue Benchmark [Member] \| Tenant Base [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	2.60%
Revenue Benchmark [Member] \| Houston, Texas Geographic Concentration [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	19.60%
Revenue Benchmark [Member] \| Other Parts of Texas Geographic Concentration [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	9.40%
COVID-19 [Member]
Significant Accounting Policies [Line Items]
Adjustment to revenue related to potentially uncollectible revenues and disputed amounts	$ 9,000
Straight Line Rent Receivables [Member]
Significant Accounting Policies [Line Items]
Adjustment to revenue related to potentially uncollectible revenues and disputed amounts	$ 7,000
FLORIDA \| Revenue Benchmark [Member] \| Geographic Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	21.30%
CALIFORNIA \| Revenue Benchmark [Member] \| Geographic Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	17.20%
Gain on Cash Flow Hedges [Member]
Significant Accounting Policies [Line Items]
Accumulated other comprehensive loss	$ 3,393	$ 3,614	$ 4,282	$ 4,501
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)