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GOODWILL AND LONG-LIVED ASSETS - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
segment
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Number of reporting units | segment       3    
Goodwill impairment $ 0   $ 0 $ 109,486 $ 0  
Intangible asset amortization expense 2,400   3,800 4,900 7,700  
Goodwill 211,718     211,718   $ 325,017
Long-lived asset impairment 0     22,351    
Long-lived asset impairment 0   $ 0 22,351 $ 0  
Leasehold improvements            
Finite-Lived Intangible Assets [Line Items]            
Long-lived asset impairment       7,558    
Leasehold improvements | Other Restructuring [Member]            
Finite-Lived Intangible Assets [Line Items]            
Long-lived asset impairment 4,800     4,800    
Right-of-use assets - operating leases, net            
Finite-Lived Intangible Assets [Line Items]            
Long-lived asset impairment       19,645    
Right-of-use assets - operating leases, net | Other Restructuring [Member]            
Finite-Lived Intangible Assets [Line Items]            
Long-lived asset impairment 9,200     9,200    
International            
Finite-Lived Intangible Assets [Line Items]            
Goodwill impairment       109,486    
Goodwill 26,600     26,600   146,332
Long-lived asset impairment 400 $ 22,400        
North America            
Finite-Lived Intangible Assets [Line Items]            
Goodwill impairment       0    
Goodwill 178,685     $ 178,685   $ 178,685
Long-lived asset impairment $ 13,500          
Minimum            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, useful life       1 year    
Maximum            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, useful life       10 years