Stock-based Compensation Expense and Share Repurchase - (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock-based compensation expense:
Total stock-based compensation included in costs and expenses	$ 89,687	$ 82,436	$ 183,478	$ 160,572
Stock-based compensation expense related to inventories	(248)	(80)	(700)	(545)
Share-based compensation expense by type of award	89,687	82,436	183,478	160,572
Income tax effect	(26,118)	5,030	(65,642)	(16,829)
Total stock-based compensation included in costs and expenses, net of tax	63,569	87,466	117,836	143,743
Cost of sales
Stock-based compensation expense:
Total stock-based compensation included in costs and expenses	1,503	1,191	2,841	2,004
Research and development expenses
Stock-based compensation expense:
Total stock-based compensation included in costs and expenses	55,632	51,612	115,347	100,100
Sales, general and administrative expenses
Stock-based compensation expense:
Total stock-based compensation included in costs and expenses	32,552	29,633	65,290	58,468
Restricted stock and restricted stock units (including PSUs)
Stock-based compensation expense:
Total stock-based compensation included in costs and expenses	60,966	51,497	124,476	101,915
Type of award:
Unrecognized Expense	$ 408,282		408,282
Weighted-average Recognition Period	2 years 4 months 13 days
Stock options
Stock-based compensation expense:
Total stock-based compensation included in costs and expenses	$ 26,160	28,591	54,316	54,646
Type of award:
Unrecognized Expense	$ 164,006		164,006
Weighted-average Recognition Period	2 years 8 months 8 days
ESPP share issuances
Stock-based compensation expense:
Total stock-based compensation included in costs and expenses	$ 2,809	$ 2,428	5,386	$ 4,556
Type of award:
Unrecognized Expense	$ 6,364		$ 6,364
Weighted-average Recognition Period	18 days