Preferred tax rate for subsidiaries operating as a preferred enterprise not operating in a Development Zone.

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Standard corporate income tax rate charged in certain countries.

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Tax year that remains open to examination under enacted tax laws for succeeding period.

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Tax year that remains open to examination under enacted tax laws.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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Income Taxes, Income Taxes continued (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 01, 2015
Tax Benefits Under Law of Encouragements [Abstract]
Tax exempt period	2 years
Rate at which subsidiary earnings are taxed (in hundredths)	34.00%	34.00%	34.00%
Reconciliation of the beginning and ending amount of unrecognized tax benefits [Roll Forward]
Beginning balance	$ 644us-gaap_UnrecognizedTaxBenefits	$ 375us-gaap_UnrecognizedTaxBenefits	$ 2,700us-gaap_UnrecognizedTaxBenefits
Additions / Settlements	0	269	(2,325)
Ending balance	$ 644us-gaap_UnrecognizedTaxBenefits	$ 644us-gaap_UnrecognizedTaxBenefits	$ 375us-gaap_UnrecognizedTaxBenefits
Minimum [Member]
Tax Benefits Under Law of Encouragements [Abstract]
Succeeding tax exempt period	5 years
Maximum [Member]
Tax Benefits Under Law of Encouragements [Abstract]
Succeeding tax exempt period	8 years
Israeli subsidiary [Member]
Tax Benefits Under Law of Encouragements [Abstract]
Tax exempt rate (in hundredths)	15.00%
Israeli subsidiary [Member] \| Current Period [Member]
Tax Benefits Under Law of Encouragements [Abstract]
Standard corporate income tax rate (in hundredths)	25.00%
Israeli subsidiary [Member] \| Prospective [Member]
Tax Benefits Under Law of Encouragements [Abstract]
Standard corporate income tax rate (in hundredths)	26.50%
Preferred income tax rate (in hundredths)	16.00%
United Kingdom Tax Authority [Member]
Tax Benefits Under Law of Encouragements [Abstract]
Rate at which subsidiary earnings are taxed (in hundredths)	21.00%	23.00%	24.00%
United Kingdom Tax Authority [Member] \| Subsequent Event [Member]
Tax Benefits Under Law of Encouragements [Abstract]
Rate at which subsidiary earnings are taxed (in hundredths)				20.00%