Revenue Recognition (Schedule of Consolidated Statement of Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net sales	$ 229,981	$ 199,277
Cost of goods sold	148,330	123,249
Gross profit	81,651	76,028
Selling, general, and administrative expenses	41,930	40,407
Technical and research expenses	10,317	10,262
Restructuring expenses, net	8,573	2,681
Operating income	20,831	22,678
Interest expense, net	4,288	4,328
Other expense, net	1,452	826
Income before income taxes	15,091	17,524
Income tax expense	4,609	6,550
Net income	10,482	10,974
Net income attributable to the noncontrolling interest	237	135
Net income attributable to the Company	$ 10,245	$ 10,839
Earnings per share attributable to Company shareholders - Basic	$ 0.32	$ 0.34
Earnings per share attributable to Company shareholders - Diluted	$ 0.32	$ 0.34
As reported [Member]
Net sales	$ 229,981
Cost of goods sold	148,330
Gross profit	81,651
Selling, general, and administrative expenses	41,930
Technical and research expenses	10,317
Restructuring expenses, net	8,573
Operating income	20,831
Interest expense, net	4,288
Other expense, net	1,452
Income before income taxes	15,091
Income tax expense	4,609
Net income	10,482
Net income attributable to the noncontrolling interest	237
Net income attributable to the Company	$ 10,245
Earnings per share attributable to Company shareholders - Basic	$ 0.32
Earnings per share attributable to Company shareholders - Diluted	$ 0.32
Adjustments to reverse effects of ASC 606 [Member]
Net sales	$ (8,434)
Cost of goods sold	(6,526)
Gross profit	(1,908)
Selling, general, and administrative expenses	(60)
Technical and research expenses
Restructuring expenses, net
Operating income	(1,848)
Interest expense, net
Other expense, net
Income before income taxes	(1,848)
Income tax expense	(601)
Net income	(1,247)
Net income attributable to the noncontrolling interest	(57)
Net income attributable to the Company	$ (1,190)
Earnings per share attributable to Company shareholders - Basic	$ (0.04)
Earnings per share attributable to Company shareholders - Diluted	$ (0.04)
As adjusted to exclude adoption of ASC 606 [Member]
Net sales	$ 221,547
Cost of goods sold	141,804
Gross profit	79,743
Selling, general, and administrative expenses	41,870
Technical and research expenses	10,317
Restructuring expenses, net	8,573
Operating income	18,983
Interest expense, net	4,288
Other expense, net	1,452
Income before income taxes	13,243
Income tax expense	4,008
Net income	9,235
Net income attributable to the noncontrolling interest	180
Net income attributable to the Company	$ 9,055
Earnings per share attributable to Company shareholders - Basic	$ 0.28
Earnings per share attributable to Company shareholders - Diluted	$ 0.28