CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Total Diodes Incorporated Stockholders' Equity	Noncontrolling Interest
BALANCE at Dec. 31, 2019	$ 1,152,783	$ 35,111	$ (37,768)	$ 427,262	$ 789,958	$ (108,139)	$ 1,106,424	$ 46,359
Common stock shares beginning at Dec. 31, 2019		52,664,000	(1,457,000)
Total comprehensive income	80,208				68,353	11,034	79,387	821
Acquisition/Net changes in noncontrolling interests	(6,153)			(1,225)			(1,225)	(4,928)
Contributions from noncontrolling interests	11,779							11,779
Dividends to noncontrolling interests	(1,553)							(1,553)
Common stock issued for share-based plans	4,397	$ 517		3,880			4,397
Common stock issued for share-based plans, shares		775,000
Share-based compensation	17,833			17,833			17,833
Deferred compensation plan			$ (1,437)	1,437
Deferred compensation plan, shares			(37,000)
Tax related to net share settlement	(8,243)			(8,243)			(8,243)
BALANCE at Sep. 30, 2020	1,251,051	$ 35,628	$ (39,205)	440,944	858,311	(97,105)	1,198,573	52,478
Common stock shares ending at Sep. 30, 2020		53,439,000	(1,494,000)
BALANCE at Jun. 30, 2020	1,195,627	$ 35,389	$ (38,660)	433,989	831,159	(118,492)	1,143,385	52,242
Common stock shares beginning at Jun. 30, 2020		53,082,000	(1,483,000)
Total comprehensive income	48,773				27,152	21,387	48,539	234
Acquisition/Net changes in noncontrolling interests	2							2
Common stock issued for share-based plans	3,332	$ 239		3,093			3,332
Common stock issued for share-based plans, shares		(357,000)
Share-based compensation	6,155			6,155			6,155
Deferred compensation plan			$ (545)	545
Deferred compensation plan, shares			(11,000)
Tax related to net share settlement	(2,838)			(2,838)			(2,838)
BALANCE at Sep. 30, 2020	1,251,051	$ 35,628	$ (39,205)	440,944	858,311	(97,105)	1,198,573	52,478
Common stock shares ending at Sep. 30, 2020		53,439,000	(1,494,000)
BALANCE at Dec. 31, 2020	$ 1,016,123	$ 35,692	$ (335,910)	449,598	888,046	(73,606)	963,820	52,303
Common stock shares beginning at Dec. 31, 2020	44,276,194	53,536,000	(9,260,000)
Total comprehensive income	$ 185,304				163,250	15,325	178,575	6,729
Acquisition/Net changes in noncontrolling interests	4,152			(22)			(22)	4,174
Dividends to noncontrolling interests	(2,156)							(2,156)
Common stock issued for share-based plans	4,337	$ 502		3,835			4,337
Common stock issued for share-based plans, shares		753,000
Share-based compensation	24,103			24,103			24,103
Deferred compensation plan	(0)		$ (984)	984			(0)
Deferred compensation plan, shares			(13,000)
Tax related to net share settlement	(14,750)			(14,750)			(14,750)
BALANCE at Sep. 30, 2021	$ 1,217,113	$ 36,194	$ (336,894)	463,748	1,051,296	(58,281)	1,156,063	61,050
Common stock shares ending at Sep. 30, 2021	45,015,853	54,289,000	(9,273,000)
BALANCE at Jun. 30, 2021	$ 1,142,997	$ 35,998	$ (336,128)	455,683	982,872	(55,841)	1,082,584	60,413
Common stock shares beginning at Jun. 30, 2021		53,994,000	(9,263,000)
Total comprehensive income	68,360				68,424	(2,440)	65,984	2,376
Acquisition/Net changes in noncontrolling interests	167							167
Dividends to noncontrolling interests	(1,906)							(1,906)
Common stock issued for share-based plans	2,234			2,038			2,234
Share-based compensation	9,965	$ 0		9,965			9,965
Share-based compensation, shares		0
Deferred compensation plan	(0)		$ (766)	766			(0)
Deferred compensation plan, shares			(10,000)
Tax related to net share settlement	(4,704)			(4,704)			(4,704)
BALANCE at Sep. 30, 2021	$ 1,217,113	$ 36,194	$ (336,894)	$ 463,748	$ 1,051,296	$ (58,281)	$ 1,156,063	$ 61,050
Common stock shares ending at Sep. 30, 2021	45,015,853	54,289,000	(9,273,000)