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Fair Value Measurements and Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 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.
June 30, 2021
Level 1Level 2Level 3Total
Assets:    
Investment securities    
Money market funds $49,696 $362,892 $— $412,588 
Equity securities— 30,115 — 30,115 
Commingled fixed income securities1,706 19,325 — 21,031 
Government and related securities
26,052 25,974 — 52,026 
Corporate debt securities— 67,674 — 67,674 
Mortgage-backed / asset-backed securities— 206,520 — 206,520 
Derivatives 
Interest rate swap— 445 — 445 
Foreign exchange contracts— 438 — 438 
Total assets$77,454 $713,383 $— $790,837 
Liabilities:    
Derivatives    
Foreign exchange contracts$— $(1,722)$— $(1,722)
Total liabilities$— $(1,722)$— $(1,722)
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:
June 30, 2021
Amortized costGross unrealized gainsGross unrealized lossesEstimated fair value
Government and related securities$51,055 $107 $(636)$50,526 
Corporate debt securities69,475 357 (2,158)67,674 
Commingled fixed income securities1,716 — (10)1,706 
Mortgage-backed / asset-backed securities210,012 247 (3,739)206,520 
Total$332,258 $711 $(6,543)$326,426 
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:
June 30, 2021December 31, 2020
Fair ValueGross unrealized lossesFair ValueGross unrealized losses
Less than 12 continuous months$287,161 $6,483 $132,267 $1,072 
Greater than 12 continuous months2,016 60 2,369 76 
Total$289,177 $6,543 $134,636 $1,148 
Available-for-sale Securities
Scheduled maturities of available-for-sale securities at June 30, 2021 were as follows:
Amortized costEstimated fair value
Within 1 year$13,147 $13,149 
After 1 year through 5 years21,318 21,261 
After 5 years through 10 years60,188 58,612 
After 10 years237,605 233,404 
Total$332,258 $326,426 
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The fair value of derivative instruments was as follows:
Designation of DerivativesBalance Sheet LocationJune 30,
2021		December 31,
2020
Derivatives designated as
hedging instruments		  
Foreign exchange contractsOther current assets and prepayments$60 $96 
 Accounts payable and accrued liabilities(41)(112)
Interest rate swapsOther assets (Other noncurrent liabilities)445 (2,163)
Derivatives not designated as
hedging instruments		  
Foreign exchange contractsOther current assets and prepayments378 3,680 
 Accounts payable and accrued liabilities(1,681)(1,848)
 Total derivative assets$883 $3,776 
 Total derivative liabilities(1,722)(4,123)
 Total net derivative liability$(839)$(347)
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location
Results of cash flow hedging relationships were as follows:
Three Months Ended June 30,
Derivative Gain (Loss)
Recognized in AOCL
(Effective Portion)		Location of Gain (Loss)
(Effective Portion)		Gain (Loss) Reclassified
from AOCL to Earnings
(Effective Portion)
Derivative Instrument2021202020212020
Foreign exchange contracts$(54)$(121)Revenue$118 $(64)
   Cost of sales(47)32 
Interest rate swap(3,672)(1,605)Interest expense— — 
 $(3,726)$(1,726) $71 $(32)
 Six Months Ended June 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 Instrument2021202020212020
Foreign exchange contracts$174 $(281)Revenue$244 $(3)
   Cost of sales(105)42 
Interest rate swap2,608 (1,605)Interest expense— — 
 $2,782 $(1,886) $139 $39 
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location All outstanding contracts at June 30, 2021 mature within 12 months.
The mark-to-market adjustments of non-designated derivative instruments were as follows:
Three Months Ended June 30,
Derivative Gain (Loss) Recognized in Earnings
Derivatives InstrumentLocation of Derivative Gain (Loss)20212020
Foreign exchange contractsSelling, general and administrative expense$514 $1,200 
Six Months Ended June 30,
Derivative Gain (Loss) Recognized in Earnings
Derivatives InstrumentLocation of Derivative Gain (Loss)20212020
Foreign exchange contractsSelling, general and administrative expense$1,067 $(3,667)
Fair Value, by Balance Sheet Grouping The carrying value and estimated fair value of debt was as follows:
June 30, 2021December 31, 2020
Carrying value$2,427,713 $2,564,393 
Fair value$2,482,619 $2,479,895