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Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Original amounts:	$ 149,077	$ 147,221
Accumulated amortization:	107,598	96,210
Intangible assets, net	41,479	51,011
Capitalized software costs [Member]
Finite-Lived Intangible Assets [Line Items]
Original amounts:	78,793	75,126
Accumulated amortization:	66,123	61,834
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Original amounts:	54,850	56,296
Accumulated amortization:	33,578	27,967
Backlog and non-compete agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Original amounts:	2,712	2,712
Accumulated amortization:	2,674	2,486
Acquired technology [Member]
Finite-Lived Intangible Assets [Line Items]
Original amounts:	12,722	13,087
Accumulated amortization:	$ 5,223	$ 3,923

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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+ References

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