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ACQUISITIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Sep. 09, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 367,198 $ 365,947   $ 308,729
Home Solutions        
Business Acquisition [Line Items]        
Accounts receivable     $ 11,956  
Inventories     3,199  
Prepaids and other assets     852  
Total current assets     16,007  
Property and equipment     4,350  
Goodwill     58,468  
Other long-term assets     891  
Total assets     111,716  
Accounts payable     14,575  
Accrued liabilities     3,986  
Total liabilities     18,561  
Net assets acquired     93,155  
Home Solutions | Managed care contracts        
Business Acquisition [Line Items]        
Intangible assets     24,600  
Home Solutions | Licenses        
Business Acquisition [Line Items]        
Intangible assets     5,400  
Home Solutions | Trade name        
Business Acquisition [Line Items]        
Intangible assets     1,800  
Home Solutions | Non-compete agreements        
Business Acquisition [Line Items]        
Intangible assets     $ 200