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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2018
Jan. 03, 2018
Mar. 06, 2017
Jan. 18, 2017
Jan. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Feb. 16, 2018
Jan. 30, 2018
Mar. 13, 2017
Subsidiary, Sale of Stock [Line Items]                      
Issuance of common stock in acquisitions             $ 50,011 $ 0      
Number of shares registered for resale or other disposition                 944,586    
Issuance of common stock             $ 0 $ 88,656      
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)   114,285   128,572              
US Premium Financing Holding Company                      
Subsidiary, Sale of Stock [Line Items]                      
Ownership percentage   25.01%   4.99%              
US Premium Financing Holding Company                      
Subsidiary, Sale of Stock [Line Items]                      
Ownership percentage                   30.00%  
Price per share of the Company's common stock (in dollars per share)   $ 48.55   $ 45.45              
Cost method investment   $ 5,500   $ 5,800           $ 23,900  
US Premium Financing Holding Company                      
Subsidiary, Sale of Stock [Line Items]                      
Percentage of voting interests acquired 70.00%       70.00%            
Equity interest issued or issuable, number of shares (in shares) 830,301       1,073,158            
Share price (in dollars per share) $ 53.55       $ 53.55            
Issuance of common stock in acquisitions $ 44,500       $ 55,900