CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 652,036	$ 594,462
Cost of sales	359,413	322,506
Gross profit	292,623	271,956
Selling, general and administrative expenses	134,848	132,015
Restructuring expenses and asset impairments	2,228	0
Operating income	155,547	139,941
Other (income) expense - net	(848)	1,565
Interest expense	10,776	10,877
Income before income taxes	145,619	127,499
Provision for income taxes	32,947	25,501
Net income	112,672	101,998
Net (income) loss attributable to noncontrolling interest	36	0
Net income attributable to IDEX	$ 112,708	$ 101,998
Earnings per common share:
Basic earnings per common share attributable to IDEX (in dollars per share)	$ 1.48	$ 1.35
Diluted earnings per common share attributable to IDEX (in dollars per share)	$ 1.48	$ 1.33
Share data:
Basic weighted average common shares outstanding (in shares)	75,892	75,740
Diluted weighted average common shares outstanding (in shares)	76,341	76,452