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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Intangible assets      
Amortizing intangibles $ 66,872 $ 66,875  
Accumulated amortization (61,227) (56,801)  
Amortizing intangibles, net 5,645 10,074  
Non-amortizing intangibles 1,066,741 1,048,972  
Intangibles, net 1,072,386 1,059,046  
Amortization expense 4,400 7,700 $ 11,600
Impairment $ 0 $ 8,700 $ 0
Minimum      
Intangible assets      
Useful life of intangible assets 5 years    
Maximum      
Intangible assets      
Useful life of intangible assets 7 years