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Non-Controlling Interests and Preferred Stock of Subsidiaries - Summary of Non-controlling Interests Balance on Condensed Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Balance as of            
Temporary equity $ 2,567 $ 3,844 $ 3,890 $ 3,754 $ 3,832 $ 3,912
Total Non-controlling interests 7,802   7,776      
DME, Inc.            
Balance as of            
Temporary equity 2,567   3,890      
Permanent equity 2,567   3,890      
Total DME Inc. 5,134   7,780      
GP Corp.            
Balance as of            
Permanent equity (840)   (782)      
GE FM Holdings            
Balance as of            
Permanent equity 808   $ 778      
Forest            
Balance as of            
Permanent equity $ 2,700