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K. INCOME TAXES - OPERATIONS INCOME (Details) - USD ($)
$ 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
Income Tax Disclosure [Abstract]                      
Domestic                 $ 10,047 $ 14,062 $ 1,226
Foreign (loss) income                 10,956 (2,894) 3,256
Income(loss) before income taxes $ 15,466 $ 6,404 $ 655 $ (1,522) $ 2,513 $ 3,106 $ 6,224 $ (675) $ 21,003 $ 11,168 $ 4,482