Revenue - Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total net sales	$ 642,099	$ 634,360	$ 1,264,330	$ 1,246,684
Intersegment elimination
Disaggregation of Revenue [Line Items]
Total net sales	(386)	(143)	(2,126)	(400)
U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	324,877	312,638	636,754	612,096
North America, excluding U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	26,543	0	50,472	0
Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	153,560	157,822	309,618	322,319
Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	109,599	113,204	213,135	208,383
Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	27,906	50,839	56,477	104,286
FMT
Disaggregation of Revenue [Line Items]
Total net sales	246,111	242,755	488,447	475,016
FMT | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	246,111	242,755	488,447	475,016
FMT | Intersegment elimination
Disaggregation of Revenue [Line Items]
Total net sales	(78)	(45)	(264)	(117)
FMT | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	139,786	139,347	277,935	272,500
FMT | North America, excluding U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	14,628	0	27,685	0
FMT | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	43,949	40,097	87,573	83,696
FMT | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	32,353	34,899	64,270	61,297
FMT | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	15,473	28,457	31,248	57,640
FMT | North America, Excluding United States Included in Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales		15,631		29,219
HST
Disaggregation of Revenue [Line Items]
Total net sales	232,172	227,367	456,860	448,334
HST | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	232,172	227,367	456,860	448,334
HST | Intersegment elimination
Disaggregation of Revenue [Line Items]
Total net sales	(81)	(36)	(683)	(144)
HST | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	106,193	97,544	205,244	191,352
HST | North America, excluding U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	5,497	0	10,389	0
HST | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	65,798	74,023	135,170	147,802
HST | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	50,502	48,240	98,561	92,788
HST | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	4,263	7,596	8,179	16,536
HST | North America, Excluding United States Included in Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales		4,038		7,358
FSDP
Disaggregation of Revenue [Line Items]
Total net sales	163,816	164,238	319,023	323,334
FSDP | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	163,816	164,238	319,023	323,334
FSDP | Intersegment elimination
Disaggregation of Revenue [Line Items]
Total net sales	(227)	(62)	(1,179)	(139)
FSDP | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	78,898	75,747	153,575	148,244
FSDP | North America, excluding U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	6,418	0	12,398	0
FSDP | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	43,813	43,702	86,875	90,821
FSDP | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	26,744	30,065	50,304	54,298
FSDP | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales	$ 8,170	14,786	$ 17,050	30,110
FSDP | North America, Excluding United States Included in Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total net sales		$ 6,297		$ 13,906