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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2013
Effective income tax rate reconciliation [Line Items]
Statutory income tax rate (in hundredths)	34.00%
Israeli subsidiaries [Member]
Effective income tax rate reconciliation [Line Items]
Rate at which subsidiary earnings are taxed (in hundredths)	20.00%
UK Subsidiaries [Member]
Effective income tax rate reconciliation [Line Items]
Rate at which subsidiary earnings are taxed (in hundredths)	24.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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