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Fair Value Measurements and Derivative Instruments (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 01, 2017
Feb. 28, 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 0 0    
Fair value, liabilities, transfers Level 1 to Level 2 0 0 0 0    
Fair value, liabilities, transfers Level 2 to Level 3 0 0 0 0    
Fair value, assets and liabilities, transfers into/(out of) Level 3 0 0 0 0    
Interest Rate Derivatives [Member]            
Fair Value Measurements And Derivative Instruments [Line Items]            
Net gain (loss) on interest rate instruments $ 157,000 $ 202,000 $ 584,000 $ 137,000    
Redemption Rights [Member] | Series E Preferred Stock [Member]            
Fair Value Measurements And Derivative Instruments [Line Items]            
Number of shares called by redemption         490,250  
Level 3 [Member] | Redemption Rights [Member] | Series E Preferred Stock [Member]            
Fair Value Measurements And Derivative Instruments [Line Items]            
Assets fair value         $ 150,000 $ 150,000