Employee Equity Incentive Plans and Stock-Based Compensation Expense - Summary of Restricted Stock Plan Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, Beginning Balance (in shares) | shares	1,000
Granted (in shares) | shares	101
Vested (in shares) | shares	(55)
Cancelled (in shares) | shares	(24)
Outstanding, Ending Balance (in shares) | shares	1,022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 48.44
Granted (in dollars per share) | $ / shares	32.89
Vested (in dollars per share) | $ / shares	43.46
Cancelled (in dollars per share) | $ / shares	46.72
Outstanding, Ending Balance (in dollars per share) | $ / shares	$ 47.21