Revenue Recognition (Schedule of Consolidated Statement of Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales	$ 256,225	$ 215,571	$ 486,206	$ 414,848
Cost of goods sold	164,047	152,393	312,377	275,642
Gross profit	92,178	63,178	173,829	139,206
Selling, general, and administrative expenses	36,707	41,314	78,637	81,721
Technical and research expenses	10,198	9,973	20,515	20,235
Restructuring expenses, net	2,589	2,036	11,162	4,717
Operating income	42,684	9,855	63,515	32,533
Interest expense, net	4,621	4,285	8,909	8,613
Other expense, net	726	2,558	2,178	3,384
Income before income taxes	37,337	3,012	52,428	20,536
Income tax expense	7,031	1,779	11,640	8,329
Net income	30,306	1,233	40,788	12,207
Net income/(loss) attributable to the noncontrolling interest	(59)	116	178	251
Net income attributable to the Company	$ 30,365	$ 1,117	$ 40,610	$ 11,956
Earnings per share attributable to Company shareholders - Basic	$ 0.94	$ 0.03	$ 1.26	$ 0.37
Earnings per share attributable to Company shareholders - Diluted	$ 0.94	$ 0.03	$ 1.26	$ 0.37
As reported [Member]
Net sales	$ 256,225		$ 486,206
Cost of goods sold	164,047		312,377
Gross profit	92,178		173,829
Selling, general, and administrative expenses	36,707		78,637
Technical and research expenses	10,198		20,515
Restructuring expenses, net	2,589		11,162
Operating income	42,684		63,515
Interest expense, net	4,621		8,909
Other expense, net	726		2,178
Income before income taxes	37,337		52,428
Income tax expense	7,031		11,640
Net income	30,306		40,788
Net income/(loss) attributable to the noncontrolling interest	(59)		178
Net income attributable to the Company	$ 30,365		$ 40,610
Earnings per share attributable to Company shareholders - Basic	$ 0.94		$ 1.26
Earnings per share attributable to Company shareholders - Diluted	$ 0.94		$ 1.26
Adjustments to reverse effects of ASC 606 [Member]
Net sales	$ 400		$ (8,034)
Cost of goods sold	2,304		(4,222)
Gross profit	(1,904)		(3,812)
Selling, general, and administrative expenses	5		(55)
Technical and research expenses
Restructuring expenses, net
Operating income	(1,909)		(3,757)
Interest expense, net
Other expense, net
Income before income taxes	(1,909)		(3,757)
Income tax expense	(507)		(1,108)
Net income	(1,402)		(2,649)
Net income/(loss) attributable to the noncontrolling interest	(27)		(84)
Net income attributable to the Company	$ (1,375)		$ (2,565)
Earnings per share attributable to Company shareholders - Basic	$ (0.04)		$ (0.08)
Earnings per share attributable to Company shareholders - Diluted	$ (0.04)		$ (0.08)
As adjusted to exclude adoption of ASC 606 [Member]
Net sales	$ 256,625		$ 478,172
Cost of goods sold	166,351		308,155
Gross profit	90,274		170,017
Selling, general, and administrative expenses	36,712		78,582
Technical and research expenses	10,198		20,515
Restructuring expenses, net	2,589		11,162
Operating income	40,775		59,758
Interest expense, net	4,621		8,909
Other expense, net	726		2,178
Income before income taxes	35,428		48,671
Income tax expense	6,524		10,532
Net income	28,904		38,139
Net income/(loss) attributable to the noncontrolling interest	(86)		94
Net income attributable to the Company	$ 28,990		$ 38,045
Earnings per share attributable to Company shareholders - Basic	$ 0.90		$ 1.18
Earnings per share attributable to Company shareholders - Diluted	$ 0.90		$ 1.18