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5.5% Series B Cumulative Convertible Preferred Stock (Tables)
6 Months Ended
Jun. 30, 2019
Temporary Equity Disclosure [Abstract]  
Schedule of Dividends Declared
The following table summarizes dividends declared (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Series B Convertible Preferred Stock
$
1,707

 
$
1,708

 
$
3,414

 
$
3,415