Fair Value Measurements and Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following tables show, by level within the fair value hierarchy, our financial assets and liabilities that are accounted for at fair value on a recurring basis at December 31, 2015 and 2014. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect their placement within the fair value hierarchy.

	December 31, 2015
	Level 1		Level 2			Level 3		Total
Assets:
Investment securities
Money market funds / commercial paper	$	41,215	$	292,412		$	—	$	333,627
Equity securities	—		24,538			—		24,538
Commingled fixed income securities	—		22,571			—		22,571
Debt securities - U.S. and foreign governments, agencies and municipalities	102,235		12,566			—		114,801
Debt securities - corporate	—		62,884			—		62,884
Mortgage-backed / asset-backed securities	—		178,234			—		178,234
Derivatives
Foreign exchange contracts	—		1,716			—		1,716
Total assets	$	143,450	$	594,921		$	—	$	738,371
Liabilities:
Derivatives
Foreign exchange contracts	$	—	$	(5,387	)	$	—	$	(5,387	)
Total liabilities	$	—	$	(5,387	)	$	—	$	(5,387	)

	December 31, 2014
	Level 1		Level 2			Level 3		Total
Assets:
Investment securities
Money market funds / commercial paper	$	505,643	$	193,986		$	—	$	699,629
Equity securities	—		27,409			—		27,409
Commingled fixed income securities	—		24,077			—		24,077
Debt securities - U.S. and foreign governments, agencies and municipalities	113,974		24,006			—		137,980
Debt securities - corporate	—		67,448			—		67,448
Mortgage-backed / asset-backed securities	—		156,614			—		156,614
Derivatives
Foreign exchange contracts	—		1,386			—		1,386
Total assets	$	619,617	$	494,926		$	—	$	1,114,543
Liabilities:
Derivatives
Foreign exchange contracts	$	—	$	(2,988	)	$	—	$	(2,988	)
Total liabilities	$	—	$	(2,988	)	$	—	$	(2,988	)

Available-for-sale Securities

At December 31, 2015 and 2014, available-for-sale securities consisted of the following:

	December 31, 2015
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Estimated fair value
U.S. and foreign governments, agencies and municipalities	$	114,265	$	1,804	$	(1,268	)	$	114,801
Corporate	63,140		823		(1,079		)	62,884
Mortgage-backed / asset-backed securities	177,821		1,901		(1,488		)	178,234
Total	$	355,226	$	4,528	$	(3,835	)	$	355,919

	December 31, 2014
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Estimated fair value
U.S. and foreign governments, agencies and municipalities	$	135,839	$	2,905	$	(764	)	$	137,980
Corporate	66,170		1,569		(291		)	67,448
Mortgage-backed / asset-backed securities	155,330		2,362		(1,078		)	156,614
Total	$	357,339	$	6,836	$	(2,133	)	$	362,042

Schedule of Available-for-sale Securities Reconciliation

At December 31, 2015, the amortized cost and estimated fair value of available-for-sale securities have scheduled maturities as follows:

	Amortized cost		Estimated fair value
Within 1 year	$	47,014	$	46,987
After 1 year through 5 years	74,649		75,123
After 5 years through 10 years	53,432		53,753
After 10 years	180,131		180,056
Total	$	355,226	$	355,919

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

The fair value of our derivative instruments at December 31, 2015 and 2014 was as follows:

		December 31,
Designation of Derivatives	Balance Sheet Location	2015			2014
Derivatives designated as hedging instruments
Foreign exchange contracts	Other current assets and prepayments	$	217		$	762
	Accounts payable and accrued liabilities	(208		)	—
Derivatives not designated as hedging instruments
Foreign exchange contracts	Other current assets and prepayments	1,499			624
	Accounts payable and accrued liabilities	(5,179		)	(2,988		)
	Total derivative assets	1,716			1,386
	Total derivative liabilities	(5,387		)	(2,988		)
	Total net derivative liability	$	(3,671	)	$	(1,602	)

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location

The following represents the results of cash flow hedging relationships for the years ended December 31, 2015 and 2014:

	Year Ended December 31,
	Derivative Gain (Loss) Recognized in AOCI (Effective Portion)				Location of Gain (Loss) (Effective Portion)	Gain (Loss) Reclassified from AOCI to Earnings (Effective Portion)
Derivative Instrument	2015		2014			2015		2014
Foreign exchange contracts	$	887	$	1,878	Revenue	$	1,082	$	1,276
					Cost of sales	558		(140		)
						$	1,640	$	1,136

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location

The following represents the results of our non-designated derivative instruments for the years ended December 31, 2015 and 2014:

		Year Ended December 31,
		Derivative Gain (Loss) Recognized in Earnings
Derivatives Instrument	Location of Derivative Gain (Loss)	2015			2014
Foreign exchange contracts	Selling, general and administrative expense	$	(6,849	)	$	(4,701	)

Fair Value, by Balance Sheet Grouping

The carrying value and estimated fair value of our debt at December 31, 2015 and 2014 was as follows:

	December 31,
	2015		2014
Carrying value	$	2,968,997	$	3,252,006
Fair value	$	3,102,890	$	3,440,383