Fair value is determined based on the exchange price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date.

We are required to use an established hierarchy for fair value measurements based upon the inputs to the valuation and degree to which they are observable or not observable in the market. The three levels in the hierarchy are as follows:

The highest priority is assigned to Level 1 inputs and the lowest priority to Level 3 inputs. We did not hold any Level 3 assets or liabilities as of March 31, 2021 or December 31, 2020.

The following table present information about the Company’s assets measured at fair value on a recurring basis. The Company assesses the levels for the investments at each measurement date, and transfers between levels are recognized on the actual date of the event or change in circumstances that caused the transfer in accordance with the Company’s accounting policy regarding the recognitions of transfers between levels of the fair value hierarchy.

The table below present the balances of our invested assets measured at fair value on a recurring basis:

March 31, 2021	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Invested Assets:	(in thousands)
Debt Securities Available-for-sale
U.S. government and agency securities	$	43,519	$	370	$	43,149	$	—
States, municipalities and political subdivisions		96,925		—		96,925		—
Special revenue		290,086		—		290,086		—
Hybrid securities		100		—		100		—
Industrial and miscellaneous		192,293		—		192,293		—
Total investments	$	622,923	$	370	$	622,553	$	—

December 31, 2020	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Invested Assets:	(in thousands)
Debt Securities Available-for-sale
U.S. government and agency securities	$	30,593	$	371	$	30,222	$	—
States, municipalities and political subdivisions		85,670		—		85,670		—
Special revenue		274,321		—		274,321		—
Hybrid securities		100		—		100		—
Industrial and miscellaneous		170,327		—		170,327		—
Total investments	$	561,011	$	371	$	560,640	$	—

The carrying value of premium receivables and accounts payable, accrued expense, revolving loans and borrowings under our senior secured credit facility approximate their fair value. The rate at which revolving loans and borrowings under our senior secured credit facility bear interest resets periodically at market interest rates. All of these items are considered Level 1 assets and liabilities.

Assets and liabilities that are measured at fair value on a non-recurring basis include intangible assets and goodwill which are recognized at fair value during the period in which an acquisition is completed, from updated estimates and assumptions during the measurement period, or when they are considered to be impaired. These non-recurring fair value measurements, primarily for intangible assets acquired, were based on Level 3 unobservable inputs. For the quarters ended March 31, 2021 and 2020, these non-recurring fair values inputs consisted of brand, agent relationships, renewal rights, customer relations, trade names, non-compete and goodwill. To evaluate such assets for a potential impairment, we determine the fair value of the goodwill and intangible assets using a combination of a discounted cash flow approach and market approaches, which contain significant unobservable inputs and therefore are considered a Level 3 fair value measurement. The unobservable inputs in the analysis generally include future cash flow projections and a discount rate.

There were no non-recurring fair value adjustments to intangible assets and goodwill during the first quarters of 2021 and 2020. We record any measurement period adjustments to the fair value of assets acquired and liabilities assumed, with the corresponding offset to goodwill.