XML 59 R49.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Measurements and Derivative Instruments (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 01, 2017
Feb. 28, 2017
Fair Value Measurements And Derivative Instruments [Line Items]        
Transfers between levels $ 0 $ 0    
Interest Rate Derivatives [Member]        
Fair Value Measurements And Derivative Instruments [Line Items]        
Net gain (loss) on interest rate instruments $ 427,000 $ (65,000)    
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