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Condensed Consolidated Statements of Operations and Other Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating revenues:
Total operating revenues	$ 108,470	$ 96,992	$ 329,521	$ 273,121
Cost of sales	72,729	62,299	223,051	187,038
Gross profit	35,741	34,693	106,470	86,083
Operating expenses:
Selling expense	(11,334)	(10,922)	(32,115)	(28,626)
General and administrative expense	(8,855)	(8,504)	(26,303)	(24,578)
Total operating expenses	(20,189)	(19,426)	(58,418)	(53,204)
Operating income	15,552	15,267	48,052	32,879
Non-operating income	450	780	1,078	2,588
Equity method income	295		273
Foreign currency transactions (losses) gains	(12,006)	(2,494)	(9,921)	(828)
Interest expense and deferred cost of financing	(5,876)	(5,140)	(17,220)	(15,551)
(Loss) Income before taxes	(1,585)	8,413	22,262	19,088
Income tax benefit (provision)	266	(2,261)	(8,590)	(6,187)
Net (loss) income	(1,319)	6,152	13,672	12,901
Loss (Income) attributable to non-controlling interest	144	145	(30)	429
(Loss) Income attributable to parent	(1,175)	6,297	13,642	13,330
Comprehensive income:
Net income (loss)	(1,319)	6,152	13,672	12,901
Foreign currency translation adjustments	(8,486)	(1,998)	(8,768)	564
Change in fair value derivative contracts	(941)		(941)
Total comprehensive income (loss)	(10,746)	4,154	3,963	13,465
Comprehensive (income) loss attributable to non-controlling interest	144	145	(30)	429
Total comprehensive income (loss) attributable to parent	$ (10,602)	$ 4,299	$ 3,933	$ 13,894
Basic income (loss)per share	$ (0.03)	$ 0.15	$ 0.31	$ 0.33
Diluted income (loss) per share	$ (0.03)	$ 0.15	$ 0.31	$ 0.32
Basic weighted average common shares outstanding	45,519,472	40,294,762	43,793,163	39,301,161
Diluted weighted average common shares outstanding	45,519,472	40,887,997	44,386,398	39,894,396
External Customers [Member]
Operating revenues:
Total operating revenues	$ 106,741	$ 95,325	$ 323,808	$ 269,317
Related Parties [Member]
Operating revenues:
Total operating revenues	$ 1,729	$ 1,667	$ 5,713	$ 3,804

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