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4. FACILITY ACQUISITIONS AND DISPOSITIONS (Tables)
12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Schedule of assets held for sale

The following table summarizes the major categories of assets classified as held for sale in the accompanying Consolidated Balance Sheets at December 31, 2016 (in thousands):

  

Property and equipment, net   $ 1,056  
Other assets     21  
Goodwill     1,126  
Total assets held for sale   $ 2,203