XML 48 R49.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
EQUITY AND MEZZANINE EQUITY - Exchange Rights (Details) - USD ($)
$ / shares in Units, $ in Thousands
8 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Apr. 30, 2018
Apr. 30, 2017
Class of Stock [Line Items]        
Number of Units (in shares) 9,000 136,000 149,000  
Aggregate Cost $ 499 $ 8,142 $ 8,775  
Average Price Per Unit (in dollars per share) $ 53.12 $ 60.02 $ 58.90  
Total Book Value $ 0 $ 0 $ 0 $ 0
Exercise of Exchange Rights        
Class of Stock [Line Items]        
Partners' capital account, Number of Units (in shares) 174,000 33,000 3,000  
Total Book Value $ 7,823 $ 649 $ 34