Reconciliation of Segment Information to Consolidated Statements of Operations (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income (loss) from operations	$ 40,746,000	$ 27,617,000	$ 70,816,000	$ 41,799,000
Unallocated amounts:
Share-based compensation expense	(15,278,000)	(7,480,000)	(30,895,000)	(22,242,000)
Loss from manufacturing facility damage and shutdown	0	0	(7,056,000)	0
Acquisition-related charges	(1,497,000)	(1,759,000)	(3,125,000)	(4,014,000)
French building underutilization and other	(1,166,000)	0	(2,462,000)	0
Restructuring credits (charges)	1,583,000	(582,000)	1,807,000	(43,396,000)
Gain related to foundry arrangements	2,071,000	1,514,000	2,129,000	1,514,000
Recovery of receivables from foundry supplier	0	83,000	0	522,000
Settlement charges	0	0	0	(21,600,000)
Gain on sale of assets	0	0	0	4,430,000
Consolidated income (loss) from operations	26,459,000	19,393,000	31,214,000	(42,987,000)
Micro-Controllers
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income (loss) from operations	30,326,000	15,170,000	49,152,000	19,975,000
Nonvolatile Memories
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income (loss) from operations	8,036,000	5,318,000	13,083,000	10,164,000
RF and Automotive
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income (loss) from operations	3,284,000	1,403,000	10,038,000	2,713,000
Multi-market and other
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income (loss) from operations	$ (900,000)	$ 5,726,000	$ (1,457,000)	$ 8,947,000