Marketable Securities

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Marketable securities:

As of December 31, 2023, the Company had $13,867 of trading securities and $768,364 of available-for-sale securities (December 31, 2022 – $276,642 and $386,885, respectively). Amortized cost, unrealized gain (losses) recognized in accumulated other comprehensive income (loss) and fair value of available-for-sale securities consisted of the following:


	December 31, 2023							December 31, 2022
	Amortized Cost		Unrealized Gain (Loss)			Fair Value		Amortized Cost		Unrealized Loss			Fair Value
Contractual maturity of 0 to 1 years:
Guaranteed investment certificates	$	7,549	$	135		$	7,684	$	14,953	$	—		$	14,953
U.S. treasuries		192,193		(249	)		191,944		78,880		(837	)		78,043
U.S. government securities		98,092		(180	)		97,912		5,793		(20	)		5,773
Commercial paper		119,041		67			119,108		150,560		—			150,560
Corporate debt securities		58,824		100			58,924		8,942		(68	)		8,874
Contractual maturity of 1 to 3 years:
U.S. treasuries		53,294		243			53,537		60,354		(958	)		59,396
U.S. government securities		—		—			—		26,741		(35	)		26,706
Corporate debt securities		238,458		797			239,255		42,672		(92	)		42,580
Total	$	767,451	$	913		$	768,364	$	388,895	$	(2,010	)	$	386,885

Allowance for credit losses or impairment on these marketable securities have not been recognized as these securities are high credit quality, investment grade securities that the Company does not intend to sell and will not be required to sell prior to their anticipated recovery, and the decline in fair value is primarily due to changes in interest rates.