Business Segments and Geographic Information - Schedule of Information on Company's Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total net sales	$ 614,822	$ 581,113	$ 561,249	$ 594,462	$ 605,997	$ 624,246	$ 642,099	$ 622,231	$ 2,351,646	$ 2,494,573	$ 2,483,666
Total operating income	138,965	$ 131,213	$ 110,594	$ 139,941	134,173	$ 141,765	$ 155,283	$ 147,782	520,713	579,003	569,088
Interest expense									44,746	44,341	44,134
Other (income) expense - net									5,627	1,759	(3,985)
Income before taxes									470,340	532,903	528,939
Total assets	4,414,398				3,813,912				4,414,398	3,813,912	3,473,857
Depreciation and Amortization									83,495	76,876	77,544
Total capital expenditures									51,545	50,912	56,089
Intersegment elimination
Segment Reporting Information [Line Items]
Total net sales									(3,471)	(3,671)	(1,333)
Corporate office and other
Segment Reporting Information [Line Items]
Total operating income									(64,845)	(71,711)	(80,252)
Total assets	559,374				330,694				559,374	330,694	230,637
Depreciation and Amortization									562	670	742
Total capital expenditures									3,082	1,815	191
FMT
Segment Reporting Information [Line Items]
Total net sales									895,474	956,523	951,275
Total operating income									235,011	285,256	275,060
Total assets	1,387,067				1,150,712				1,387,067	1,150,712	1,107,777
Depreciation and Amortization									25,939	22,152	22,370
Total capital expenditures									11,924	17,285	19,541
FMT | Intersegment elimination
Segment Reporting Information [Line Items]
Total net sales									830	505	277
FMT | Operating Segments
Segment Reporting Information [Line Items]
Total net sales									896,304	957,028	951,552
HST
Segment Reporting Information [Line Items]
Total net sales									893,353	912,623	895,970
Total operating income									206,356	200,200	205,679
Total assets	1,576,093				1,507,108				1,576,093	1,507,108	1,329,368
Depreciation and Amortization									41,778	39,721	39,939
Total capital expenditures									27,626	22,001	26,039
HST | Intersegment elimination
Segment Reporting Information [Line Items]
Total net sales									2,609	1,823	449
HST | Operating Segments
Segment Reporting Information [Line Items]
Total net sales									895,962	914,446	896,419
FSDP
Segment Reporting Information [Line Items]
Total net sales									562,819	625,427	636,421
Total operating income									144,191	165,258	168,601
Total assets	$ 891,864				$ 825,398				891,864	825,398	806,075
Depreciation and Amortization									15,216	14,333	14,493
Total capital expenditures									8,913	9,811	10,318
FSDP | Intersegment elimination
Segment Reporting Information [Line Items]
Total net sales									32	1,343	607
FSDP | Operating Segments
Segment Reporting Information [Line Items]
Total net sales									$ 562,851	$ 626,770	$ 637,028