Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY NARRATIVE (Details)

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STOCKHOLDERS' EQUITY NARRATIVE (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 17, 2018
Feb. 06, 2018
Feb. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Apr. 07, 2016
Jan. 12, 2016
Jul. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common Stock, Dividends, Per Share, Declared $ 0.14 $ 0.13   $ 1.90 $ 0.45 $ 2.03 $ 0.89      
CommonStockSpecialDividendsPerShareDeclared $ 1.76                  
Share-based compensation expense         $ 8,600   $ 17,300      
Stock repurchase program, amount authorized                 $ 70,000,000.0 $ 15,000,000.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount       $ 32,000,000.0   $ 32,000,000.0        
Common Stock, Dividends, Per Share, Cash Paid           $ 2.03        
Dividends, Common Stock, Cash $ 20,022,000                  
Dividends, Cash $ 1,592,000 $ 1,479,000       $ 23,093,000        
Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)     34,202              
Award vesting period (in years)     3 years              
Equity Incentive Plan 2016 | Common Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares authorized               2,500,000    
Equity Incentive Plan 2016 | Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)           34,202