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Segment Geographical Information and Major Customers (Tables)

12 Months Ended

Dec. 31, 2017

Segment Geographical Information and Major Customers [Abstract]

Schedule of reported segment results of operation

			Software services				IT professional services				Unallocated expense				Total
	2015
	Total revenues		$	67,271			$	108,759			$	-			$	176,030
	Expenses			52,963				98,384				3,249				154,596
	Segment operating income (loss)		$	14,308			$	10,375			$	(3,249	)		$	21,434
	Depreciation and amortization		$	6,562			$	3,042			$	281			$	9,885

			Software services				IT professional services				Unallocated expense				Total
	2016
	Total revenues		$	70,834			$	130,812			$	-			$	201,646
	Expenses			58,847				118,414				3,298				180,559
	Segment operating income (loss)		$	11,987			$	12,398			$	(3,298	)		$	21,087
	Depreciation and amortization		$	7,531			$	3,769			$	308			$	11,608
	2017
	Total revenues		$	77,100			$	181,040			$	-			$	258,140
	Expenses			63,649				164,558				3,977				232,184
	Segment operating income (loss)		$	13,451			$	16,482			$	(3,977	)		$	25,956
	Depreciation and amortization		$	9,242			$	4,100			$	269			$	13,611

Schedule of total revenues classified according to geographical destination

			Year ended December 31,
			2015				2016				2017
	Israel		$	36,401			$	58,079			$	91,917
	Europe			29,084				23,642				26,635
	United States			92,577				100,470				123,113
	Japan			10,092				11,226				9,253
	Other			7,876				8,229				7,222
			$	176,030			$	201,646			$	258,140

Schedule of long-lived assets

			December 31,
			2016				2017
	Israel		$	110,213			$	111,217
	Europe			1,302				1,289
	United States			30,777				32,223
	Japan			4,887				5,008
	Other			3,068				2,931
			$	150,247			$	152,668

X

- Definition

Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer.

+ References

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- Definition

Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 22
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