Marketable Securities | 4. Marketable Securities ASC Topic 820, Fair Value Measurements and Disclosures , defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The accounting guidance classifies the inputs used to measure fair value into the following hierarchy: Level 1 Unadjusted quoted prices in active markets for the identical asset or liability Level 2 Observable inputs for the asset or liability, either directly or indirectly, such as quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are observable for the asset or liability Level 3 Unobservable inputs for the asset or liability The Company endeavors to utilize the best available information in measuring fair value. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Valuation is based on prices obtained from an independent pricing vendor using both market and income approaches. The primary inputs to the valuation include quoted prices for similar assets in active markets, quoted prices for identical or similar assets in markets that are not active, contractual cash flows, benchmark yields, and credit spreads. The method described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. Marketable securities classified as available-for-sale securities are summarized below: Available-For-Sale Securities Fair Value Level Amortized Cost Gross Unrealized Gross Unrealized Fair Value U.S. Treasury securities Level 2 $ 2,930 $ — $ — $ 2,930 Agency securities Level 2 16,950 — ( 872 ) 16,078 Mortgage-backed securities Level 2 40,072 — ( 5,642 ) 34,430 Corporate debt securities Level 2 1,089,503 172 ( 69,461 ) 1,020,214 Municipal securities Level 2 301,221 — ( 24,728 ) 276,493 Other Level 2 5,159 — ( 580 ) 4,579 Total $ 1,455,835 $ 172 $ ( 101,283 ) $ 1,354,724 Available-For-Sale Securities Fair Value Level Amortized Cost Gross Unrealized Gross Unrealized Fair Value U.S. Treasury securities Level 2 $ — $ — $ — $ — Agency securities Level 2 7,000 — ( 786 ) 6,214 Mortgage-backed securities Level 2 45,373 — ( 4,525 ) 40,848 Corporate debt securities Level 2 1,106,688 188 ( 77,802 ) 1,029,074 Municipal securities Level 2 326,058 3 ( 28,861 ) 297,200 Other Level 2 10,466 — ( 2,154 ) 8,312 Total $ 1,495,585 $ 191 $ ( 114,128 ) $ 1,381,648 The primary objectives of the Company’s investment policy are to preserve capital, maintain an acceptable degree of liquidity, and maximize yield within the constraint of low credit risk. The fair value of securities varies from period to period due to changes in interest rates, the performance of the underlying collateral, and the credit performance of the underlying issuer, among other factors. Accrued interest receivable, which totale d $ 10,935 a s of September 30, 2023 , is excluded from both the fair value and amortized cost basis of available-for-sale securities and is included within prepaid expenses and other current assets on the Company’s condensed consolidated balance sheets. The Company writes off impaired accrued interest on a timely basis, generally within 30 days of the due date, by reversing interest income. No accrued interest was written off during the 39-week period ended September 30, 2023. The Company recognizes impairments relating to credit losses of available-for-sale securities through an allowance for credit losses and other income (expense) on the Company’s condensed consolidated statements of income. Impairment not relating to credit losses is recorded in accumulated other comprehensive income (loss) on the Company’s condensed consolidated balance sheets. The cost of securities sold is based on the specific identification method. Approximately 99 % of securities in the Company’s portfolio were at an unrealized loss position as of September 30, 2023. The following tables display additional information regarding gross unrealized losses and fair value by major security type for available-for-sale securities in an unrealized loss position as of September 30, 2023 and December 31, 2022. As of September 30, 2023 Less than 12 Consecutive Months 12 Consecutive Months or Longer Total Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value U.S. Treasury securities $ — $ — $ — $ — $ — $ — Agency securities ( 132 ) 9,818 ( 740 ) 6,260 ( 872 ) 16,078 Mortgage-backed securities ( 13 ) 150 ( 5,629 ) 34,279 ( 5,642 ) 34,429 Corporate debt securities ( 3,446 ) 110,263 ( 66,015 ) 894,729 ( 69,461 ) 1,004,992 Municipal securities ( 131 ) 6,985 ( 24,597 ) 268,008 ( 24,728 ) 274,993 Other — — ( 580 ) 4,579 ( 580 ) 4,579 Total $ ( 3,722 ) $ 127,216 $ ( 97,561 ) $ 1,207,855 $ ( 101,283 ) $ 1,335,071 As of December 31, 2022 Less than 12 Consecutive Months 12 Consecutive Months or Longer Total Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value U.S. Treasury securities $ — $ — $ — $ — $ — $ — Agency securities — — ( 786 ) 6,214 ( 786 ) 6,214 Mortgage-backed securities ( 1,900 ) 23,229 ( 2,625 ) 17,619 ( 4,525 ) 40,848 Corporate debt securities ( 26,680 ) 508,956 ( 51,122 ) 498,834 ( 77,802 ) 1,007,790 Municipal securities ( 2,136 ) 69,017 ( 26,725 ) 225,679 ( 28,861 ) 294,696 Other — — ( 2,154 ) 8,067 ( 2,154 ) 8,067 Total $ ( 30,716 ) $ 601,202 $ ( 83,412 ) $ 756,413 $ ( 114,128 ) $ 1,357,615 As of September 30, 2023 and December 31, 2022 , the Company had no t recognized an allowance for credit losses on any securities in an unrealized loss position. The Company has no t recorded an allowance for credit losses and charge to other income (expense) for the unrealized losses on agency, mortgage-backed, corporate debt, municipal, and other securities presented above because we do not consider the declines in fair value to have resulted from credit losses. We have not observed a significant deterioration in credit quality of these securities, which are highly rated with moderate to low credit risk. Declines in value are largely attributable to current global economic conditions. The securities continue to make timely principal and interest payments, and the fair values are expected to recover as they approach maturity. Management does not intend to sell the securities, and it is not more likely than not that the Company will be required to sell the securities, before the respective recoveries of their amortized cost bases, which may be maturity. The amortized cost and fair value of marketable securities at September 30, 2023, by maturity, are shown below. Amortized Cost Fair Value Due in one year or less $ 279,248 $ 273,050 Due after one year through five years 1,151,539 1,059,938 Due after five years through ten years 10,783 9,525 Due after ten years 14,265 12,211 Total $ 1,455,835 $ 1,354,724 |