Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross 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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Price of a single share of a number of saleable stocks of a company.

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Share-based Payments - Stock Options Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) shares	Dec. 31, 2019 shares	Jun. 30, 2019 $ / shares shares	Dec. 31, 2018 shares	Jun. 28, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	12,214,548		12,214,548		14,149,502	13,988,545	12,902,995
Share-based payments \| $	$ 2,546	$ 2,647	$ 4,982	$ 4,418
Issuance of options (in shares)				1,315,787
2015 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	10,486,569		10,486,569
2018 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	1,727,979		1,727,979
Issuance of options (in shares)			0
2020 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	0		0
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments \| $	$ 1,770	$ 2,647	$ 3,500	$ 4,418
Stock options \| 2015 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future awards to be granted (in shares)								0
Weighted Average \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price at grant date (in dollars per share) \| $ / shares						$ 13.35