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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Mar. 06, 2017
Jan. 18, 2017
Mar. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Mar. 13, 2017
Subsidiary, Sale of Stock [Line Items]            
Issuance of common stock       $ 88,656 $ 0  
Payments for capital contribution     $ 110,000      
Senior Subordinated Notes            
Subsidiary, Sale of Stock [Line Items]            
Debt instrument, interest rate, stated percentage           5.75%
Underwritten Public Offering            
Subsidiary, Sale of Stock [Line Items]            
Issuance of common stock (in shares) 2,012,500          
Shares issued, price per share (in dollars per share) $ 46.50          
Issuance of common stock $ 88,700          
Public offering deduction amount $ 4,900          
Mr. Villari            
Subsidiary, Sale of Stock [Line Items]            
Stock issued during period, purchase of assets (in shares)   128,572        
US Premium Financing Holding Company            
Subsidiary, Sale of Stock [Line Items]            
Cost method investment ownership percentage   4.99%        
US Premium Financing Holding Company            
Subsidiary, Sale of Stock [Line Items]            
Stock issued during period, purchase of assets (in shares)   128,572        
Price per share of the Company's common stock (in dollars per share)   $ 45.45        
Cost method investment   $ 5,800   $ 5,800