Financial Instruments and Risk Management (Tables)

12 Months Ended

Dec. 31, 2015

Investments All Other Investments [Abstract]

The notional amounts of these derivatives as of December 31, 2015 were as follows:

	$ in millions
Forward exchange and options for conversion of:
Euros into Dollars		16.6
Japanese Yen into Dollars		63.7
Dollars into NIS		17.9
Korean Won into Dollars		18.2
Chinese Yuan into Dollars		15.6
Taiwan Dollars into Dollars		20.5
Dollars into British Pounds		90.5

Activity in Accumulated Other Comprehensive Income (Loss)

The following table summarizes activity in accumulated other comprehensive income (loss) related to derivatives classified as foreign currency cash flow hedges held by the Company during the reported years:

	Year ended December 31
	2015			2014			2013
	$ in thousands
Balance at beginning of year		(1,928	)		409			628
Unrealized gains (losses) from derivatives		(4,155	)		(2,364	)		2,050
Reclassifications into earnings from other comprehensive income (loss):
included in revenues		(249	)		(1,917	)		(809	)
included in various statements of operations items		4,969			1,667			(1,519	)
Tax effect		(115	)		277			59
Balance at end of year		(1,477	)		(1,928	)		409

Company's Assets and Liabilities Measured on Recurring Basis

The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis at December 31, 2015 and 2014, consistent with the fair value hierarchy provisions of the applicable accounting rules:

	Level 1		Level 2		Total
December 31, 2015:
Assets:
Marketable securities		6,046		—		6,046
Derivative assets not designated as hedging instruments		—		288		288
Liabilities -
Derivative liabilities designated as hedging instruments		—		1,486		1,486
Derivative liabilities not designated as hedging instruments		—		457		457
December 31, 2014:
Assets:
Marketable securities		5,890				5,890
Derivative assets not designated as hedging instruments				1,665		1,665
Liabilities -
Derivative liabilities designated as hedging instruments				1,891		1,891
Derivative liabilities not designated as hedging instrument				218		218