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Series B Cumulative Convertible Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Dividends Declared
Dividends—The following table summarizes the dividends declared during the period (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Common stock
$
20,695

 
$
20,623

 
$
12,287

Preferred stock:
 
 
 
 
 
Series D cumulative preferred stock
376

 
—

 
—

Total dividends declared
$
21,071

 
$
20,623

 
$
12,287

The following table summarizes dividends declared (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Series B Convertible Preferred Stock
$
6,829

 
$
6,795

 
$
3,860