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Fair Value Measurements and Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2021
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.
March 31, 2021
Level 1Level 2Level 3Total
Assets:    
Investment securities    
Money market funds $39,573 $250,390 $— $289,963 
Equity securities— 28,100 — 28,100 
Commingled fixed income securities1,698 19,027 — 20,725 
Government and related securities
26,228 25,396 — 51,624 
Corporate debt securities— 65,950 — 65,950 
Mortgage-backed / asset-backed securities— 231,863 — 231,863 
Derivatives 
Interest rate swap— 4,117 — 4,117 
Foreign exchange contracts— 1,117 — 1,117 
Total assets$67,499 $625,960 $— $693,459 
Liabilities:    
Derivatives    
Foreign exchange contracts$— $(786)$— $(786)
Total liabilities$— $(786)$— $(786)
December 31, 2020
Level 1Level 2Level 3Total
Assets:    
Investment securities    
Money market funds $73,228 $434,791 $— $508,019 
Equity securities— 26,583 — 26,583 
Commingled fixed income securities1,722 19,669 — 21,391 
Government and related securities
16,776 16,757 — 33,533 
Corporate debt securities — 71,433 — 71,433 
Mortgage-backed / asset-backed securities— 220,678 — 220,678 
Derivatives   
Foreign exchange contracts— 3,776 — 3,776 
Total assets$91,726 $793,687 $— $885,413 
Liabilities:    
Derivatives    
Interest rate swap$— $(2,163)$— $(2,163)
Foreign exchange contracts— (1,960)— (1,960)
Total liabilities$— $(4,123)$— $(4,123)
Schedule of Available-for-sale Securities Reconciliation
Available-for-sale securities consisted of the following:
March 31, 2021
Amortized costGross unrealized gainsGross unrealized lossesEstimated fair value
Government and related securities$51,411 $42 $(1,377)$50,076 
Corporate debt securities69,913 300 (4,263)65,950 
Commingled fixed income securities1,712 — (14)1,698 
Mortgage-backed / asset-backed securities237,827 303 (6,267)231,863 
Total$360,863 $645 $(11,921)$349,587 
December 31, 2020
Amortized costGross unrealized gainsGross unrealized lossesEstimated fair value
Government and related securities$31,882 $157 $(78)$31,961 
Corporate debt securities71,174 614 (355)71,433 
Commingled fixed income securities1,706 16 — 1,722 
Mortgage-backed / asset-backed securities220,659 734 (715)220,678 
Total$325,421 $1,521 $(1,148)$325,794 
Schedule of Unrealized Holding Losses
Investment securities in a loss position were as follows:
March 31, 2021December 31, 2020
Fair ValueGross unrealized lossesFair ValueGross unrealized losses
Less than 12 continuous months$312,002 $11,850 $132,267 $1,072 
Greater than 12 continuous months2,294 71 2,369 76 
Total$314,296 $11,921 $134,636 $1,148 
Available-for-sale Securities
Scheduled maturities of available-for-sale securities at March 31, 2021 were as follows:
Amortized costEstimated fair value
Within 1 year$14,398 $14,401 
After 1 year through 5 years15,241 15,266 
After 5 years through 10 years66,618 63,185 
After 10 years264,606 256,735 
Total$360,863 $349,587 
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The fair value of derivative instruments was as follows:
Designation of DerivativesBalance Sheet LocationMarch 31,
2021		December 31,
2020
Derivatives designated as
hedging instruments		  
Foreign exchange contractsOther current assets and prepayments$214 $96 
 Accounts payable and accrued liabilities(71)(112)
Interest rate swapsOther assets (Other noncurrent liabilities)4,117 (2,163)
Derivatives not designated as
hedging instruments		  
Foreign exchange contractsOther current assets and prepayments903 3,680 
 Accounts payable and accrued liabilities(715)(1,848)
 Total derivative assets$5,234 $3,776 
 Total derivative liabilities(786)(4,123)
 Total net derivative asset (liability)$4,448 $(347)
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 March 31,
Derivative Gain (Loss)
Recognized in AOCL
(Effective Portion)		Location of Gain (Loss)
(Effective Portion)		Gain (Loss) Reclassified
from AOCL to Earnings
(Effective Portion)
Derivative Instrument2021202020212020
Foreign exchange contracts$228 $(160)Revenue$126 $61 
   Cost of sales(58)10 
Interest rate swap6,280 — Interest expense— — 
 $6,508 $(160) $68 $71 
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location All outstanding contracts at March 31, 2021 mature within 12 months.
The mark-to-market adjustments of non-designated derivative instruments were as follows:
Three Months Ended March 31,
Derivative Gain (Loss) Recognized in Earnings
Derivatives InstrumentLocation of Derivative Gain (Loss)20212020
Foreign exchange contractsSelling, general and administrative expense$553 $(4,867)
Fair Value, by Balance Sheet Grouping The carrying value and estimated fair value of debt was as follows:
March 31, 2021December 31, 2020
Carrying value$2,438,857 $2,564,393 
Fair value$2,426,062 $2,479,895