Amount of cash inflow from exercise of option under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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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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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Number of share options (or share units) exercised during the current period.

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Stock incentive plans - Stock option awards (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Aggregate Intrinsic Value
Cash proceeds from exercise of stock option			$ 708	$ 470	$ 9,979
Stock options
Number of Options
Outstanding at beginning of period (in shares)			235,000
Exercised (in shares)			(105,000)	(69,000)	(972,000)
Canceled/forfeited (in shares)			(21,000)
Outstanding and exercisable at end of period (in shares)	109,000	235,000	109,000	235,000
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)			$ 7.67
Exercised (in dollars per share)			6.71
Canceled/forfeited (in dollars per share)			12.15
Outstanding and exercisable at end of period (in dollars per share)	$ 7.75	$ 7.67	$ 7.75	$ 7.67
Weighted-Average Remaining Contract Life (years)
Outstanding and exercisable at end of period	1 year 9 months 18 days	2 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding and exercisable at end of period	$ 559	$ 870	$ 559	$ 870
Total intrinsic value of stock options exercised (in dollars)			$ 697	$ 423	$ 14,935