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SHAREHOLDERS' EQUITY - Additional Information (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Feb. 20, 2018
$ / shares
Dec. 31, 2017
USD ($)
board_member
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 1995
shares
Class Of Stock [Line Items]        
Preferred Stock, shares authorized ( in shares)   5,000,000 5,000,000  
Number of board members elected by class A shareholders | board_member   2    
Common stock voting rights   Each share of the Company’s common stock entitles the holder to one vote on all matters to be voted upon by the shareholders.    
Common Stock, shares authorized (in shares)   100,000,000 100,000,000  
Common Stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01  
Common Stock, shares issued (in shares)   48,476,034 48,270,990  
Common Stock, shares outstanding (in shares)   47,118,171 46,913,127  
Common stock dividends declared per share | $ / shares   $ 0.12    
Common stock dividends paid per share | $ / shares   $ 0.12    
Common stock dividends paid | $   $ 5.7    
Subsequent Event [Member]        
Class Of Stock [Line Items]        
Common stock dividends declared per share | $ / shares $ 0.06      
Dividend declared date Feb. 20, 2018      
Dividend payable date Mar. 30, 2018      
Dividend record date Mar. 15, 2018      
Series A Nonconvertible Preferred Stock [Member]        
Class Of Stock [Line Items]        
Preferred Stock, shares issued (in shares)   200,000 200,000 200,000
Preferred Stock, liquidation value per share (in dollars per share) | $ / shares   $ 7.50 $ 7.50  
Preferred stock voting rights   Holders of the Series A shares are entitled to one vote per share on matters which shareholders are generally entitled to vote.    
Preferred Stock, shares outstanding (in shares)   200,000 200,000