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Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Weighted average common shares outstanding during the period - shares used for basic earnings per common share	9,915	10,033	9,933	10,024
Common shares issuable under share based payment plans which are potentially dilutive	45	76	45	75
Common shares used for diluted earnings per common share	9,960	10,109	9,978	10,099
Income (loss) from continuing operations	$ 2,952	$ (879)	$ 4,593	$ (1,572)
Discontinued operations	6,776	120,465	6,862	122,187
Net income attributable to the Company	$ 9,825	$ 119,982	$ 11,723	$ 121,542
Basic earnings per common share:
Income (loss) from continuing operations	$ 0.30	$ (0.09)	$ 0.46	$ (0.16)
Discontinued operations	0.68	12.01	0.69	12.19
Net income	0.99	11.96	1.18	12.13
Diluted earnings per common share
Income (loss) from continuing operations	0.30	(0.09)	0.46	(0.16)
Discontinued operations	0.68	11.92	0.69	12.10
Net income	$ 0.99	$ 11.87	$ 1.17	$ 12.04

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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