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Fair Value Measurements (Quantitative Information About Significant Unobservable Inputs (Level 3) Used) (Details) - Significant Unobservable Inputs (Level 3) [Member] - Property [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / ft²
Discounted Cash Flows [Member] | Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 10.50%
Capitalization rate 8.80%
Holding period (years) 5 years
Average market rent rate 11.00
Average leasing cost per square foot 10.00
Discounted Cash Flows [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 12.00%
Capitalization rate 10.00%
Holding period (years) 10 years
Expected future inflation rate 2.00%
Expense growth rate 2.00%
Vacancy rate 20.00%
Renewal rate 70.00%
Average market rent rate 16.00
Average leasing cost per square foot 35.00
Fair Value [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets at fair value | $ $ 4,184
Market Rent Growth Rate [Member] | Discounted Cash Flows [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Growth rate 3.00%