Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands, ft² in Millions	9 Months Ended
Sep. 30, 2018 USD ($) ft²	Sep. 30, 2017 USD ($)
Significant Accounting Policies [Line Items]
Square footage of operating properties (in square feet) \| ft²	37.4
Net cash used in investing activities	$ 243,683	$ 91,452
Net cash provided by operating activities	$ 214,602	221,259
Base Minimum Rental Revenue [Member] \| Tenant Base [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	2.60%
Base Minimum Rental Revenue [Member] \| Houston, Texas Geographic Concentration [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	18.80%
Base Minimum Rental Revenue [Member] \| Other Parts of Texas Geographic Concentration [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	8.60%
FLORIDA \| Base Minimum Rental Revenue [Member] \| Geographic Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	20.80%
CALIFORNIA \| Base Minimum Rental Revenue [Member] \| Geographic Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk (percentage)	16.90%
Accounting Standards Update 2016-15 [Member]
Significant Accounting Policies [Line Items]
Net cash used in investing activities		(11,100)
Net cash provided by operating activities		11,100
Accounting Standards Update 2016-18 [Member]
Significant Accounting Policies [Line Items]
Increase (decrease) in restricted cash		$ 20,200

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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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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