Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands, ft² in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items]
Square footage of operating properties (in square feet) | ft²	31.4	31.4
Accrued Rent, Accrued Contract Receivables and Accounts Receivable, net	$ 73,760	$ 73,760	$ 83,639
Allowance for credit loss	0	0
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)	$ (900)
Tenant Base [Member] | Revenue Benchmark [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk		2.60%
Houston Texas Geographic Concentration [Member] | Revenue Benchmark [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk		20.10%
Other Parts Of Texas Geographic Concentration [Member] | Revenue Benchmark [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk		9.60%
FLORIDA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk		20.90%
CALIFORNIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Significant Accounting Policies [Line Items]
Concentrations of risk		17.30%
COVID-19 [Member]
Significant Accounting Policies [Line Items]
Accrued Rent, Accrued Contract Receivables and Accounts Receivable, net	9,300	$ 9,300
Rent forgiveness	300	300
Adjustment to revenue related to potentially uncollectible revenues and disputed amounts	19,300	28,700
Straight Line Rent Receivables [Member]
Significant Accounting Policies [Line Items]
Adjustment to revenue related to potentially uncollectible revenues and disputed amounts	$ 4,800	$ 12,400