Business Acquisition (Summary of Operational Results) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Net sales		$ 257,700	$ 271,100	$ 273,900	$ 251,400	$ 251,600	$ 251,900	$ 255,400	$ 223,600	$ 226,700	$ 222,100	$ 215,600	$ 199,300	$ 1,054,132	$ 982,479	$ 863,717
Operating loss														193,576	137,408	78,676
Loss before income taxes														178,212	115,247	54,708
Net loss attributable to the Company		$ 29,100	$ 40,000	$ 34,100	$ 29,200	$ 17,600	$ 27,700	$ 29,900	$ 7,700	$ 5,900	$ 15,300	$ 1,100	$ 10,800	$ 132,398	$ 82,891	$ 33,111
Loss per share:
Basic		$ 0.91	$ 1.24	$ 1.05	$ 0.90	$ 0.54	$ 0.86	$ 0.93	$ 0.24	$ 0.19	$ 0.47	$ 0.03	$ 0.34	$ 4.10	$ 2.57	$ 1.03
Diluted		$ 0.91	$ 1.24	$ 1.05	$ 0.90	$ 0.54	$ 0.86	$ 0.93	$ 0.24	$ 0.19	$ 0.47	$ 0.03	$ 0.34	$ 4.10	$ 2.57	$ 1.03
CirComp GmbH [Member]
Business Acquisition [Line Items]
Net sales	$ 485
Operating loss	(162)
Loss before income taxes	(199)
Net loss attributable to the Company	$ (324)
Loss per share:
Basic	$ (0.01)
Diluted	$ (0.01)