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Stock-Based Compensation - Stock options by exercise price range (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock options outstanding (in shares)	6,589	34,123	143,224	216,859
Outstanding options, weighted-average exercise price (in dollars per share)	$ 19.99	$ 14.69	$ 9.13	$ 8.80
Outstanding options, weighted-average remaining contractual life (Year)	2 years 10 months 24 days
Stock options exercisable (in shares)	6,214
Exercisable options, weighted-average exercise price (in dollars per share)	$ 18.18
Range 1
Outstanding options, exercise price range, lower limit (in dollars per share)	5.76
Outstanding options, exercise price range, upper limit (in dollars per share)	10.72
Range 2
Outstanding options, exercise price range, lower limit (in dollars per share)	10.73
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 11.40
Stock options outstanding (in shares)	5,089
Outstanding options, weighted-average exercise price (in dollars per share)	$ 11.17
Outstanding options, weighted-average remaining contractual life (Year)	1 year 10 months 17 days
Stock options exercisable (in shares)	5,089
Exercisable options, weighted-average exercise price (in dollars per share)	$ 11.17
Range 3
Outstanding options, exercise price range, lower limit (in dollars per share)	11.41
Outstanding options, exercise price range, upper limit (in dollars per share)	24.86
Range 4
Outstanding options, exercise price range, lower limit (in dollars per share)	24.87
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 49.91
Stock options outstanding (in shares)	1,500
Outstanding options, weighted-average exercise price (in dollars per share)	$ 49.91
Outstanding options, weighted-average remaining contractual life (Year)	6 years 4 months 9 days
Stock options exercisable (in shares)	1,125
Exercisable options, weighted-average exercise price (in dollars per share)	$ 49.91

X

- Definition

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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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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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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