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Stock-Based Compensation - Stock and Performance Options Rollforward (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Shares
Beginning balance (in shares) | shares	4,696,264
Granted (in shares) | shares	299,541
Exercised (in shares) | shares	(298,513)
Forfeited (in shares) | shares	(3,561)
Expired (in shares) | shares	(493,222)
End balance (in shares) | shares	4,200,509
Exercisable at December 31, 2020 (in shares) | shares	3,908,444
Weighted Average Exercise Price
Beginning balance (in usd per share) | $ / shares	$ 18.05
Granted (in usd per share) | $ / shares	10.46
Exercised (in usd per share) | $ / shares	6.87
Forfeited (in usd per share) | $ / shares	10.53
Expired (in usd per share) | $ / shares	43.53
Ending balance (in usd per share) | $ / shares	15.32
Exercisable at December 31, 2020 (in usd per share) | $ / shares	$ 15.68
Weighted average remaining contractual term, outstanding	4 years 2 months 4 days
Weighted average remaining contractual term (in years), exercisable	3 years 9 months 21 days
Aggregate intrinsic value, outstanding | $	$ 9,430
Aggregate intrinsic value, exercisable | $	$ 9,330

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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