Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Share-Based Compensation - Performance Contingent Awards (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Sep. 25, 2015	Aug. 28, 2015	Mar. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-Based Compensation
Vesting period	3 years
Share-based compensation expense				$ 60,450	$ 51,313	$ 49,145
Research and development
Share-Based Compensation
Share-based compensation expense				28,953	25,563	22,691
Selling, general and administrative
Share-Based Compensation
Share-based compensation expense				$ 31,497	$ 25,750	26,454
Performance-Contingent Awards - RSAs
Share-Based Compensation
Shares approved for grant (in shares)			1,575,000
Awards outstanding (in shares)				776,250	978,750
Performance-Contingent Awards - RSUs
Share-Based Compensation
Shares approved for grant (in shares)			135,000
Awards outstanding (in shares)				101,250	101,250
Performance-based vesting
Share-Based Compensation
Vesting period			5 years
RSUs
Share-Based Compensation
Vesting period			5 years
Awards outstanding (in shares)				4,939,774	3,069,403
Share-based compensation expense				$ 39,520	$ 34,077	25,959
RSUs \| Minimum
Share-Based Compensation
Vesting period		3 years
RSUs \| Maximum
Share-Based Compensation
Vesting period		4 years
Maximum potential expense \| Research and development
Share-Based Compensation
Share-based compensation expense				100
Maximum potential expense \| Selling, general and administrative
Share-Based Compensation
Share-based compensation expense				300
First tranche
Share-Based Compensation
Share-based compensation expense					1,700	2,600
Second tranche
Share-Based Compensation
Share-based compensation expense				1,900	$ 2,600	$ 6,300
Third tranche
Share-Based Compensation
Share-based compensation expense				9,800
Third tranche \| Research and development
Share-Based Compensation
Share-based compensation expense				1,000
Third tranche \| Selling, general and administrative
Share-Based Compensation
Share-based compensation expense				1,900
Third tranche \| Maximum potential expense
Share-Based Compensation
Share-based compensation expense				2,900
Second and Third tranche
Share-Based Compensation
Share-based compensation expense				$ 400