XML 53 R42.htm IDEA: XBRL DOCUMENT v3.19.1
EQUITY AND MEZZANINE EQUITY - Share Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended
Dec. 14, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 05, 2018
Share Repurchase Program        
Repurchase period 1 year      
Remaining authorized repurchase amount   $ 24,600,000    
Share Repurchase Program        
Share Repurchase Program        
Aggregate gross sales price of common share of beneficial interest allowed to be repurchased $ 50,000,000     $ 50,000,000
Shares repurchased and retired (in shares)   174 29  
Aggregate cost of common shares repurchased and retired   $ 8,804,000 $ 1,442,000  
Average cost per share (in dollars per share)   $ 50.54 $ 49.79