Stock Based Awards and Other Equity Instruments - Summary of Stock Option Activity (Details) - Stock Options - $ / shares shares in Thousands		6 Months Ended
		Jun. 30, 2020
Options Outstanding
Options Outstanding, Beginning balance		6,017
Options Outstanding, Granted		1,095
Options Outstanding, Exercised		(2)
Options Outstanding, Cancelled or expired		(732)
Options Outstanding, Ending balance		6,378
Options Outstanding, Exercisable		3,630
Options Outstanding, Vested and expected to vest	[1]	6,378
Weighted Average Exercise Price per share
Options Outstanding, Weighted Average Exercise Price, Beginning Balance		$ 50.27
Options Granted, Weighted Average Exercise Price		25.38
Options Exercised, Weighted Average Exercise Price		17.08
Options Cancelled or expired, Weighted Average Exercise Price		46.74
Options Outstanding, Weighted Average Exercise Price, Ending balance		46.42
Options Exercisable, Weighted Average Exercise Price		55.30
Options Vested and expected to vest, Weighted Average Exercise Price	[1]	$ 46.42
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value
Options Outstanding, Weighted Average Remaining Contractual Life		5 years 9 months 18 days
Options Exercisable, Weighted Average Remaining Contractual Life		3 years 10 months 24 days
Options Vested and expected to vest, Weighted Average Remaining Contractual Life	[1]	5 years 9 months 18 days

[1] The Company accounts for forfeitures as they occur, rather than estimate expected forfeitures as allowed under GAAP and   therefore do not include a forfeiture rate in our vested and expected to vest calculation unless necessary for a performance condition award.