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ACQUISITIONS (Tables)
 12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Schedule of Pro Forma Financial Information
The following table contains unaudited pro forma condensed consolidated statement of operations information for the years ended December 31, 2017 and 2016 assuming that our 2017 acquisitions closed on January 1, 2016 (amounts in millions, except per share data):
 
2017
 
2016
Net service revenue
$
1,557.6

 
$
1,501.5

Operating income (loss)
78.7

 
59.7

Net income
30.8

 
39.0

Basic earnings (loss) per share
$
0.90

 
$
1.16

Diluted earnings (loss) per share
$
0.89

 
$
1.15