Revenue Recognition (Schedule of Consolidated Statement of Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net sales	$ 253,253	$ 222,141	$ 739,459	$ 636,989
Cost of goods sold	160,227	142,582	472,604	418,224
Gross profit	93,026	79,559	266,855	218,765
Selling, general, and administrative expenses	39,071	40,575	117,708	122,296
Technical and research expenses	9,958	10,553	30,473	30,788
Restructuring expenses, net	2,552	5,503	13,714	10,220
Operating income	41,445	22,928	104,960	55,461
Interest expense, net	4,621	4,429	13,530	13,042
Other (income)/expense, net	(3,151)	(530)	(973)	2,854
Income before income taxes	39,975	19,029	92,403	39,565
Income tax expense	11,491	3,809	23,131	12,138
Net income	28,484	15,220	69,272	27,427
Net income/(loss) attributable to the noncontrolling interest	269	(49)	447	202
Net income attributable to the Company	$ 28,215	$ 15,269	$ 68,825	$ 27,225
Earnings per share attributable to Company shareholders - Basic	$ 0.87	$ 0.47	$ 2.13	$ 0.85
Earnings per share attributable to Company shareholders - Diluted	$ 0.87	$ 0.47	$ 2.13	$ 0.85
As reported [Member]
Net sales	$ 253,253		$ 739,459
Cost of goods sold	160,227		472,604
Gross profit	93,026		266,855
Selling, general, and administrative expenses	39,071		117,708
Technical and research expenses	9,958		30,473
Restructuring expenses, net	2,552		13,714
Operating income	41,445		104,960
Interest expense, net	4,621		13,530
Other (income)/expense, net	(3,151)		(973)
Income before income taxes	39,975		92,403
Income tax expense	11,491		23,131
Net income	28,484		69,272
Net income/(loss) attributable to the noncontrolling interest	269		447
Net income attributable to the Company	$ 28,215		$ 68,825
Earnings per share attributable to Company shareholders - Basic	$ 0.87		$ 2.13
Earnings per share attributable to Company shareholders - Diluted	$ 0.87		$ 2.13
Adjustments to reverse effects of ASC 606 [Member]
Net sales	$ 1,692		$ (6,342)
Cost of goods sold	2,902		(1,320)
Gross profit	(1,210)		(5,022)
Selling, general, and administrative expenses	(12)		(67)
Technical and research expenses
Restructuring expenses, net
Operating income	(1,198)		(4,955)
Interest expense, net
Other (income)/expense, net
Income before income taxes	(1,198)		(4,955)
Income tax expense	(431)		(1,539)
Net income	(767)		(3,416)
Net income/(loss) attributable to the noncontrolling interest	(27)		(111)
Net income attributable to the Company	$ (740)		$ (3,305)
Earnings per share attributable to Company shareholders - Basic	$ (0.02)		$ (0.10)
Earnings per share attributable to Company shareholders - Diluted	$ (0.02)		$ (0.10)
As adjusted to exclude adoption of ASC 606 [Member]
Net sales	$ 254,945		$ 733,117
Cost of goods sold	163,129		471,284
Gross profit	91,816		261,833
Selling, general, and administrative expenses	39,059		117,641
Technical and research expenses	9,958		30,473
Restructuring expenses, net	2,552		13,714
Operating income	40,247		100,005
Interest expense, net	4,621		13,530
Other (income)/expense, net	(3,151)		(973)
Income before income taxes	38,777		87,448
Income tax expense	11,060		21,592
Net income	27,717		65,856
Net income/(loss) attributable to the noncontrolling interest	242		336
Net income attributable to the Company	$ 27,475		$ 65,520
Earnings per share attributable to Company shareholders - Basic	$ 0.85		$ 2.03
Earnings per share attributable to Company shareholders - Diluted	$ 0.85		$ 2.03