Hedging (Tables)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Foreign Exchange Contracts, Statement of Financial Position

A summary of the aggregate contractual or notional amounts, balance sheet location and estimated fair values of derivative financial instruments designated as cash flow hedges at December 31, 2014 is as follows (in thousands):

	Contractual / Notional Amount		Consolidated Balance Sheet Classification	Estimated Fair Value
				Asset		(Liability)
Foreign currency forward exchange contracts	$	14,193	Other accrued liabilities	$	—	$	(83	)

A summary of the aggregate contractual or notional amounts, balance sheet location and estimated fair values of derivative financial instruments designated as cash flow hedges at December 31, 2013 is as follows (in thousands):

	Contractual / Notional Amount		Consolidated Balance Sheet Classification	Estimated Fair Value
				Asset		(Liability)
Foreign currency forward exchange contracts	$	15,328	Other accrued liabilities	$	—	$	(169	)

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

There were no ineffective hedges for the years ended December 31, 2014, 2013 and 2012. The following table summarizes the effect of derivative instruments on the Consolidated Statements of Operations as follows (in thousands):

	2014		2013		2012
Cost of sales	$	178	$	498	$	286
Research and development	295		544		183
Selling, general and administrative	154		158		87
Total derivative instrument expense	$	627	$	1,200	$	556

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)