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Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, plant and equipment
Depreciation	$ 9,791	$ 11,531	$ 11,719
Property, plant and equipment
Equipment and furniture	158,540	165,312
Less accumulated depreciation and amortization	(136,753)	(141,388)
Net property, plant and equipment	$ 21,787	23,924
Minimum
Property, plant and equipment
Estimated useful lives of acquired intangible assets	2 years
Maximum
Property, plant and equipment
Estimated useful lives of acquired intangible assets	10 years
Software | Minimum
Property, plant and equipment
Estimated useful lives	2 years
Software | Maximum
Property, plant and equipment
Estimated useful lives	10 years
Equipment and furniture | Minimum
Property, plant and equipment
Estimated useful lives	3 years
Equipment and furniture | Maximum
Property, plant and equipment
Estimated useful lives	20 years
Capital lease assets
Property, plant and equipment
Equipment and furniture	$ 1,774	2,357
Less accumulated depreciation and amortization	(687)	(903)
Net property, plant and equipment	$ 1,087	$ 1,454
Buildings and improvements | Minimum
Property, plant and equipment
Estimated useful lives	3 years
Buildings and improvements | Maximum
Property, plant and equipment
Estimated useful lives	40 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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+ References

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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