Fair Value Measurements and Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016 and 2015. 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, 2016
	Level 1		Level 2			Level 3		Total
Assets:
Investment securities
Money market funds / commercial paper	$	114,471	$	217,175		$	—	$	331,646
Equity securities	—		24,571			—		24,571
Commingled fixed income securities	1,536		22,132			—		23,668
Debt securities - U.S. and foreign governments, agencies and municipalities	116,822		19,358			—		136,180
Debt securities - corporate	—		69,891			—		69,891
Mortgage-backed / asset-backed securities	—		158,996			—		158,996
Derivatives
Interest rate swaps	—		1,588			—		1,588
Foreign exchange contracts	—		637			—		637
Total assets	$	232,829	$	514,348		$	—	$	747,177
Liabilities:
Derivatives
Foreign exchange contracts	$	—	$	(3,717	)	$	—	$	(3,717	)
Total liabilities	$	—	$	(3,717	)	$	—	$	(3,717	)

	December 31, 2015
	Level 1		Level 2			Level 3		Total
Assets:
Investment securities
Money market funds / commercial paper	$	41,215	$	302,779		$	—	$	343,994
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	$	605,288		$	—	$	748,738
Liabilities:
Derivatives
Foreign exchange contracts	$	—	$	(5,387	)	$	—	$	(5,387	)
Total liabilities	$	—	$	(5,387	)	$	—	$	(5,387	)

Available-for-sale Securities

At December 31, 2016 and 2015, available-for-sale securities consisted of the following:

	December 31, 2016
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Estimated fair value
U.S. and foreign governments, agencies and municipalities	$	136,316	$	1,571	$	(1,707	)	$	136,180
Corporate	69,376		1,180		(665		)	69,891
Commingled fixed income securities	1,568		—		(32		)	1,536
Mortgage-backed / asset-backed securities	159,312		1,566		(1,882		)	158,996
Total	$	366,572	$	4,317	$	(4,286	)	$	366,603

	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

Schedule of Available-for-sale Securities Reconciliation

At December 31, 2016, 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	$	42,487	$	42,523
After 1 year through 5 years	110,252		110,595
After 5 years through 10 years	58,866		58,871
After 10 years	154,967		154,614
Total	$	366,572	$	366,603

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

The fair value of our derivative instruments at December 31, 2016 and 2015 was as follows:

		December 31,
Designation of Derivatives	Balance Sheet Location	2016			2015
Derivatives designated as hedging instruments
Foreign exchange contracts	Other current assets and prepayments	$	487		$	217
	Accounts payable and accrued liabilities	(136		)	(208		)
Interest rate swaps	Other non-current assets	1,588			—
Derivatives not designated as hedging instruments
Foreign exchange contracts	Other current assets and prepayments	150			1,499
	Accounts payable and accrued liabilities	(3,581		)	(5,179		)
	Total derivative assets	2,225			1,716
	Total derivative liabilities	(3,717		)	(5,387		)
	Total net derivative liability	$	(1,492	)	$	(3,671	)

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, 2016 and 2015:

	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	2016		2015			2016			2015
Foreign exchange contracts	$	496	$	887	Revenue	$	(68	)	$	1,082
					Cost of sales	222			558
Interest Rate Swap	$	1,588	$	—	Interest Expense	—			—
						$	154		$	1,640

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, 2016 and 2015:

		Year Ended December 31,
		Derivative Gain (Loss) Recognized in Earnings
Derivatives Instrument	Location of Derivative Gain (Loss)	2016			2015
Foreign exchange contracts	Selling, general and administrative expense	$	(2,382	)	$	(6,849	)

Fair Value, by Balance Sheet Grouping

The carrying value and estimated fair value of our debt at December 31, 2016 and 2015 was as follows:

	December 31,
	2016		2015
Carrying value	$	3,364,890	$	2,950,668
Fair value	$	3,412,581	$	3,084,561