ASSETS HELD FOR SALE - Major Categories (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Net property and equipment	$ 330	$ 4,686
Radio broadcasting licenses	703	16,744
Operating lease right-of-use assets	0	1,292
Operating lease liabilities	0	(1,315)
Net assets held for sale	$ 1,033	$ 21,407