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Share based compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expenses incurred related to options granted | $	$ 221	$ 365
Unrecognized compensation costs related to options granted | $	$ 1,413	$ 1,413
Options exercisable, weighted average contractual life (in years)		1 year 7 months 2 days
Share Option Plan 2013 [Member] | $33.83 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted | shares		141,928
Exercise price of options | $ / shares		$ 33.83
Expiration date		Jan. 31, 2027
Closing price to determine expiration date | $ / shares	$ 16.92	$ 16.92

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Condition for Expiration

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

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-Publisher FASB
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Date the equity-based award expires, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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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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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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