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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) - Summary of the unaudited quarterly financial information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Net Sales $ 148,594 $ 147,597 $ 156,113 $ 148,815 $ 136,436 $ 126,205 $ 151,537 $ 126,788 $ 601,119 $ 540,966 $ 492,776
Operating Income 7,661 8,621 10,719 4,960 6,445 5,271 9,894 4,512 31,961 26,122  
Net Income Attributable to Miller Industries, Inc. $ 4,453 $ 5,522 $ 6,587 $ 3,360 $ 3,878 $ 3,168 $ 5,866 $ 3,064 $ 19,922 $ 15,976 $ 14,904
Basic Income Per Share (in dollars per share) $ 0.39 $ 0.49 $ 0.58 $ 0.30 $ 0.34 $ 0.28 $ 0.52 $ 0.27 $ 1.76 $ 1.41 $ 1.32
Diluted Income Per Share (in dollars per share) 0.38 0.49 0.58 0.30 0.34 0.28 0.52 0.27 1.75 1.41 1.31
Cash Dividends Declared Per Share (in dollars per share) $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.68 $ 0.64 $ 0.60