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Fair Value Measurements and Derivative Instruments (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 01, 2017
Fair Value Measurements And Derivative Instruments [Line Items]              
Fair value, assets, transfers Level 1 to Level 2 $ 0   $ 0   $ 0 $ 0  
Fair value, assets, transfers Level 2 to Level 1   $ 0   $ 0      
Fair value, liabilities, transfers Level 1 to Level 2   0   0      
Fair value, liabilities, transfers Level 2 to Level 3   0   0      
Fair value, assets and liabilities, transfers into/(out of) Level 3   $ 0   $ 0      
Interest Rate Derivatives [Member]              
Fair Value Measurements And Derivative Instruments [Line Items]              
Net gain (loss) on interest rate instruments $ 11,000   $ (432,000)   $ (788,000) $ (621,000)  
Redemption Rights [Member] | Series E Preferred Stock [Member]              
Fair Value Measurements And Derivative Instruments [Line Items]              
Number of shares called by redemption             490,250