Condensed Consolidated Statements of Operations and Other Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Operating revenues:
Total operating revenues	$ 255,546	$ 219,654	$ 477,834	$ 412,281
Cost of sales	(141,211)	(130,077)	(265,974)	(248,044)
Gross profit	114,335	89,577	211,860	164,237
Operating expenses:
Selling expense	(29,730)	(20,000)	(53,347)	(37,583)
General and administrative expense	(23,405)	(18,443)	(42,260)	(34,498)
Total operating expenses	(53,135)	(38,443)	(95,607)	(72,081)
Other Operating income	4		4,280
Operating income	61,204	51,134	120,533	92,156
Non-operating income, net	588	2,731	1,604	3,811
Equity method income	942	1,237	2,286	2,283
Foreign currency transactions (loss) gains	847	(5,575)	338	(5,728)
Interest expense and deferred cost of financing	(1,350)	(2,006)	(2,681)	(4,112)
Income before taxes	62,231	47,521	122,080	88,410
Income tax provision	(18,148)	(12,493)	(35,808)	(23,652)
Net income	$ 44,083	$ 35,028	$ 86,272	$ 64,758
Basic income per share	$ 0.94	$ 0.75	$ 1.84	$ 1.38
Diluted income per share	$ 0.94	$ 0.75	$ 1.84	$ 1.38
Basic weighted average common shares outstanding	46,988,155	46,996,705	46,989,650	46,996,706
Diluted weighted average common shares outstanding	46,988,155	46,996,705	46,989,650	46,996,706
Other comprehensive income:
Foreign currency translation adjustments	$ 13,260	$ (28,321)	$ 32,836	$ (28,291)
Change in fair value of derivative contracts	785	(342)	148	694
Other comprehensive income	14,045	(28,663)	32,984	(27,597)
Comprehensive income	58,128	6,365	119,256	37,161
External Customers [Member]
Operating revenues:
Total operating revenues	254,145	218,928	475,417	411,017
Related Party [Member]
Operating revenues:
Total operating revenues	$ 1,401	$ 726	$ 2,417	$ 1,264