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Fair Value Measurements and Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
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.
September 30, 2020
Level 1Level 2Level 3Total
Assets:    
Investment securities    
Money market funds $116,806 $440,493 $— $557,299 
Equity securities— 22,555 — 22,555 
Commingled fixed income securities1,720 19,537 — 21,257 
Government and related securities
17,408 18,601 — 36,009 
Corporate debt securities— 82,959 — 82,959 
Mortgage-backed / asset-backed securities— 275,352 — 275,352 
Derivatives 
Foreign exchange contracts— 2,603 — 2,603 
Total assets$135,934 $862,100 $— $998,034 
Liabilities:    
Derivatives    
Interest rate swaps$— $(2,908)$— $(2,908)
Foreign exchange contracts— (1,086)— (1,086)
Total liabilities$— $(3,994)$— $(3,994)
December 31, 2019
Level 1Level 2Level 3Total
Assets:    
Investment securities    
Money market funds $161,441 $240,364 $— $401,805 
Equity securities— 21,979 — 21,979 
Commingled fixed income securities1,656 18,404 — 20,060 
Government and related securities
64,572 17,478 — 82,050 
Corporate debt securities — 72,149 — 72,149 
Mortgage-backed / asset-backed securities— 66,339 — 66,339 
Derivatives   
Foreign exchange contracts— 3,256 — 3,256 
Total assets$227,669 $439,969 $— $667,638 
Liabilities:    
Derivatives    
Foreign exchange contracts$— $(1,402)$— $(1,402)
Total liabilities$— $(1,402)$— $(1,402)
Schedule of Available-for-sale Securities Reconciliation
Available-for-sale securities consisted of the following:
September 30, 2020
Amortized costGross unrealized gainsGross unrealized lossesEstimated fair value
Government and related securities$35,018 $144 $(719)$34,443 
Corporate debt securities84,457 422 (1,920)82,959 
Commingled fixed income securities1,699 21 — 1,720 
Mortgage-backed / asset-backed securities276,880 476 (2,004)275,352 
Total$398,054 $1,063 $(4,643)$394,474 
December 31, 2019
Amortized costGross unrealized gainsGross unrealized lossesEstimated fair value
Government and related securities$80,732 $1,358 $(114)$81,976 
Corporate debt securities70,426 2,009 (286)72,149 
Commingled fixed income securities1,675 — (19)1,656 
Mortgage-backed / asset-backed securities65,679 960 (300)66,339 
Total$218,512 $4,327 $(719)$222,120 
Schedule of Unrealized Holding Losses
Investment securities in a loss position were as follows:
September 30, 2020December 31, 2019
Fair ValueGross unrealized lossesFair ValueGross unrealized losses
Less than 12 continuous months$314,145 $4,543 $52,521 $583 
Greater than 12 continuous months3,157 100 9,227 136 
Total$317,302 $4,643 $61,748 $719 
Available-for-sale Securities
Scheduled maturities of available-for-sale securities at September 30, 2020 were as follows:
Amortized costEstimated fair value
Within 1 year$19,299 $19,379 
After 1 year through 5 years9,354 9,553 
After 5 years through 10 years54,448 53,476 
After 10 years314,953 312,066 
Total$398,054 $394,474 
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The fair value of derivative instruments was as follows:
Designation of DerivativesBalance Sheet LocationSeptember 30,
2020		December 31,
2019
Derivatives designated as
hedging instruments		  
Foreign exchange contractsOther current assets and prepayments$15 $207 
 Accounts payable and accrued liabilities(154)(56)
Interest rate swapsOther noncurrent liabilities(2,908)— 
Derivatives not designated as
hedging instruments		  
Foreign exchange contractsOther current assets and prepayments2,588 3,049 
 Accounts payable and accrued liabilities(932)(1,346)
 Total derivative assets$2,603 $3,256 
 Total derivative liabilities(3,994)(1,402)
 Total net derivative (liability) asset $(1,391)$1,854 
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location
Results of cash flow hedging relationships were as follows:
Three Months Ended September 30,
Derivative Gain (Loss)
Recognized in AOCI
(Effective Portion)		Location of Gain (Loss)
(Effective Portion)		Gain (Loss) Reclassified
from AOCI to Earnings
(Effective Portion)
Derivative Instrument2020201920202019
Foreign exchange contracts$(80)$156 Revenue$(104)$(98)
   Cost of sales(6)54 
Interest rate swap(1,303)— Interest expense— — 
 $(1,383)$156  $(110)$(44)
 Nine Months Ended September 30,
 Derivative Gain (Loss)
Recognized in AOCI
(Effective Portion)		Location of Gain (Loss)
(Effective Portion)		Gain (Loss) Reclassified
from AOCI to Earnings
(Effective Portion)
Derivative Instrument2020201920202019
Foreign exchange contracts$(361)$181 Revenue$(107)$(23)
   Cost of sales36 99 
Interest rate swap(2,908)— Interest expense— — 
 $(3,269)$181  $(71)$76 
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location All outstanding contracts at September 30, 2020 mature within 12 months.
The mark-to-market adjustments of non-designated derivative instruments were as follows:
Three Months Ended September 30,
Derivative Gain (Loss) Recognized in Earnings
Derivatives InstrumentLocation of Derivative Gain (Loss)20202019
Foreign exchange contractsSelling, general and administrative expense$891 $(11,385)
Nine Months Ended September 30,
Derivative Gain (Loss) Recognized in Earnings
Derivatives InstrumentLocation of Derivative Gain (Loss)20202019
Foreign exchange contractsSelling, general and administrative expense$(2,776)$(6,181)
Fair Value, by Balance Sheet Grouping The carrying value and estimated fair value of debt was as follows:
September 30, 2020December 31, 2019
Carrying value$2,595,221 $2,739,722 
Fair value$2,426,516 $2,572,794