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Stock-Based Compensation - Restricted Stock, Restricted Stock Unit and Stock Option Activity, Terms and Significant Assumptions for Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RSU or Restricted Stock
Restricted Stock Units or Restricted Stock, Number
Beginning balance (in shares)	1,660,311	985,132	933,464
Granted (in shares)	1,355,975	1,356,303	603,111
Expired or canceled (in shares)	(114,352)	(173,604)	(38,365)
Vested/exercised (in shares)	(643,340)	(507,520)	(513,078)
Ending balance (in shares)	2,258,594	1,660,311	985,132
Restricted Stock Units or Restricted Stock, Weighted Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share)	$ 39.88	$ 53.78	$ 51.85
Granted (in dollars per share)	10.30	32.68	57.88
Expired or canceled (in dollars per share)	33.74	39.57	54.07
Vested/exercised (in dollars per share)	42.23	47.72	51.58
Ending balance (in dollars per share)	$ 21.76	$ 39.88	$ 53.78
Stock Options
Stock Options, Number
Beginning balance (in shares)	5,381,477	4,589,385	5,069,956
Granted (in shares)	975,290	1,192,108	33,615
Expired or canceled (in shares)	(603,835)	(351,885)	(352,624)
Vested/exercised (in shares)	0	(48,131)	(161,562)
Ending balance (in shares)	5,752,932	5,381,477	4,589,385
Options exercisable (in shares)	3,784,647
Remaining unvested options outstanding and expected to vest (in shares)	1,948,602
Stock Options, Weighted Average Exercise Price Per Share
Beginning balance (in dollars per share)	$ 52.13	$ 60.25	$ 60.08
Granted (in dollars per share)	11.06	22.47	58.15
Expired or canceled (in dollars per share)	59.46	60.56	64.64
Vested/exercised (in dollars per share)	0	30.46	44.92
Ending balance (in dollars per share)	44.40	$ 52.13	$ 60.25
Options exercisable (in dollars per share)	58.80
Remaining unvested options outstanding and expected to vest (in dollars per share)	$ 16.72

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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