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RELATED PARTIES - (Tables)
 12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
Summary of Shares Sold by WCAS
The following tables summarizes the shares sold by WCAS and underwriting commissions and fees paid:
 
 
Year Ended 
 December 31,
 
 
2017
 
2016
 
2015
Shares sold by WCAS
 
4,000,000

 
4,500,000

 
—

Underwriting commissions and fees paid
 
$
225

 
$
338

 
$
—