Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Financial Instruments [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions

	As of March 31, 2015		As of December 31, 2014
Foreign currency exchange forward contracts by currency:	($ thousands)
Japanese Yen	$	93,301	$	44,533
Singapore Dollar		59,843		61,887
Euro		26,924		134,755
South Korean Won		25,223		14,590
British Pound Sterling		20,931		17,230
Mexican Peso		12,923		13,180
South African Rand		7,023		4,355
Australian Dollar		5,747		7,913
Indian Rupee		4,919		3,356
Chinese Yuan Renminbi		4,352		5,376
Canadian Dollar		3,474		3,005
Russian Ruble		2,876		1,838
New Taiwan Dollar		2,494		3,229
Hong Kong Dollar		1,892		814
Swedish Krona		1,572		1,918
Brazilian Real		1,005		—
New Zealand Dollar		709		743
Norwegian Krone		—		917
Total notional value, net	$	275,208	$	319,639
Latest maturity date	April 2015		January 2015

Schedule of Derivative Instrument Gain (Loss)

	Three Months Ended March 31,
	2015		2014		Location of Gain (Loss) Recognized in Income on Derivatives
Derivatives not designated as hedging instruments:	($ thousands)
Foreign currency exchange forwards	$	5,723	$	1,838	Foreign currency transaction (gains) losses, net