Stock-based Compensation Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock-based compensation expense:
Stock-based compensation expense	$ 290,736,000	$ 237,705,000	$ 231,025,000
Less: stock-based compensation expense capitalized to inventories	(4,906,000)	(3,607,000)	(4,087,000)
Allocated stock-based compensation expense	290,736,000	$ 237,705,000	$ 231,025,000
Stock Options
Weighted-average assumptions for options and ESPP subscriptions granted
Expected annual dividends	$ 0
Employee stock purchase plan
Weighted-average assumptions for options and ESPP subscriptions granted
Expected stock price volatility (percent)	39.09%	48.22%	47.20%
Risk-free interest rate (percent)	1.24%	0.56%	0.40%
Expected term of options (in years)	9 months	9 months	8 months 20 days
Expected annual dividends	$ 0	$ 0	$ 0
Weighted average fair value (usd per share)	$ 35.90	$ 26.86	$ 37.84
Tranche one
Weighted-average assumptions for options and ESPP subscriptions granted
Vesting rights percentage	33.30%
Tranche two
Weighted-average assumptions for options and ESPP subscriptions granted
Vesting rights percentage	33.30%
Tranche three
Weighted-average assumptions for options and ESPP subscriptions granted
Vesting rights percentage	33.30%
Performance-based RSUs
Weighted-average assumptions for options and ESPP subscriptions granted
Potential awards, percent of target shares, minimum	0.00%
Potential awards, percent of target shares, maximum	200.00%
Weighted average fair value (usd per share)	$ 86.71
Performance-based RSUs | Tranche one
Weighted-average assumptions for options and ESPP subscriptions granted
Vesting period	3 years
Performance-based RSUs | Tranche two
Weighted-average assumptions for options and ESPP subscriptions granted
Vesting period	3 years
Financial performance shares
Weighted-average assumptions for options and ESPP subscriptions granted
Vesting period	3 years
Non-financial performance shares
Weighted-average assumptions for options and ESPP subscriptions granted
Vesting period	3 years
Stock options
Stock-based compensation expense:
Stock-based compensation expense	$ 105,367,000	$ 114,768,000	$ 129,276,000
Type of award:
Unrecognized Expense	$ 147,402,000
Weighted-average Recognition Period	2 years 5 months 12 days
Weighted-average grant-date fair value, granted (usd per share)	$ 43.27	$ 37.93	$ 52.16
Weighted-average assumptions for options and ESPP subscriptions granted
Expected stock price volatility (percent)	45.31%	46.77%	47.29%
Risk-free interest rate (percent)	1.94%	1.32%	1.61%
Expected term of options (in years)	4 years 8 months 5 days	4 years 10 months 28 days	5 years 3 months 11 days
Expected annual dividends	$ 0	$ 0	$ 0
Restricted stock and restricted stock units (including PSUs)
Stock-based compensation expense:
Stock-based compensation expense	181,258,000	118,709,000	98,811,000
Type of award:
Unrecognized Expense	$ 254,302,000
Weighted-average Recognition Period	2 years 5 months 19 days
ESPP share issuances
Stock-based compensation expense:
Stock-based compensation expense	$ 9,017,000	7,835,000	7,025,000
Type of award:
Unrecognized Expense	$ 4,245,000
Weighted-average Recognition Period	7 months 2 days
Research and development expenses
Stock-based compensation expense:
Stock-based compensation expense	$ 181,900,000	153,451,000	152,955,000
Sales, general and administrative expenses
Stock-based compensation expense:
Stock-based compensation expense	$ 108,836,000	$ 84,254,000	$ 78,070,000