Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY - Dividend Activity (Details)

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STOCKHOLDERS' EQUITY - Dividend Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 23, 2018
Aug. 24, 2018
May 25, 2018
Mar. 09, 2018
Nov. 24, 2017
Aug. 31, 2017
May 19, 2017
Mar. 03, 2017
Dec. 31, 2018
Dec. 31, 2017
Stockholders' Equity Note [Abstract]                    
Special dividend per common share (in dollars per share) $ 0.18 $ 0.25 $ 1.76   $ 0.15 $ 0.25 $ 0.35 $ 0.35    
Special dividend amount $ 2,048 $ 2,844 $ 20,022   $ 1,701 $ 2,833 $ 3,964 $ 3,962    
Dividend per common share (in dollars per share) $ 0.16 $ 0.15 $ 0.14 $ 0.13 $ 0.12 $ 0.11 $ 0.10 $ 0.09 $ 2.77 $ 1.52
Dividend amount $ 1,820 $ 1,707 $ 1,592 $ 1,479 $ 1,360 $ 1,246 $ 1,133 $ 1,019 $ 31,512 $ 17,218
Payment Date Nov. 23, 2018 Aug. 24, 2018 May 25, 2018 Mar. 09, 2018 Nov. 24, 2017 Aug. 31, 2017 May 19, 2017 Mar. 03, 2017