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BUSINESS COMBINATIONS (Tables)
 6 Months Ended
Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract]  
Summary of Purchase Price Paid for Acquisitions A summary of the purchase price paid and the purchase price allocation for these acquisitions follows:
 Six Months Ended
June 30,
 20212020
Purchase Price:
Cash used in acquisitions, net of cash acquired$4,378 $19,212 
Holdbacks505 2,837 
Total4,883 22,049 
Allocated as follows:
Current assets13 132 
Land— 685 
Buildings— 2,118 
Equipment1,549 8,277 
Intangible assets1,646 5,912 
Other liabilities, net(82)(222)
Fair value of assets acquired and liabilities assumed3,126 16,902 
Excess purchase price allocated to goodwill$1,757 $5,147 
Schedule of Unaudited Pro forma Combined Information Unaudited pro forma combined information that shows our operational results as though each acquisition completed since the beginning of the prior fiscal year had occurred as of January 1, 2020 is as follows:
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2021202020212020
Revenues$216,082 $192,610 $406,242 $380,791 
Operating income$21,955 $17,629 $34,019 $24,880 
Net income$11,787 $12,181 $16,129 $13,220 
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding51,366 48,348 51,273 48,176 
Basic earnings per common share$0.23 $0.25 $0.31 $0.27 
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding51,546 48,563 51,466 48,411 
Diluted earnings per common share$0.23 $0.25 $0.31 $0.27