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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Principles of Consolidation (Q1) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Business Acquisition [Line Items]        
Gain from sale of consolidated entity $ 0 $ 387 $ 387 $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fly Dreams, LLC        
Business Acquisition [Line Items]        
Selling price   550 550  
Gain from sale of consolidated entity   $ 387 $ 387