Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2020

Investments, All Other Investments [Abstract]

Summary of Bond Activity

The following table summarizes our bond activity for the years ended December 31, 2020 and 2019 (in thousands):

	2020		2019
Fair value at January 1	$	60,659	$	56,556
Purchases	3,447		27,216
Sales	(22,078)		(1,686)
Maturities and calls	(15,409)		(22,272)
Decrease in bond premium	(857)		(460)
Fair market value adjustment	(54)		1,305
Fair value at December 31	$	25,708	$	60,659

Summary of Outstanding Interest Rate Swaps

The following table summarizes our outstanding interest rate swaps and their classification in the accompanying Consolidated Balance Sheets at December 31, 2020 and 2019 (in thousands). Refer to Note 7, Fair Value Measurements, to the accompanying consolidated financial statements for additional disclosures regarding fair value measurements.

	December 31, 2020
	Notional Amount		Fair Value		Balance Sheet Location
Interest rate swap	$	10,000	$	(13)	Other current liability
Interest rate swaps	$	85,000	$	(2,552)	Other non-current liabilities

	December 31, 2019
	Notional Amount		Fair Value		Balance Sheet Location
Interest rate swaps	$	45,000	$	(591)	Other non-current liabilities
Interest rate swap	$	25,000	$	66	Other current assets

Summary of Effects of Interest Rate Swap

The following table summarizes the effects of the interest rate swap on our accompanying Consolidated Statements of Comprehensive Income for the years ended December 31, 2020 and 2019 (in thousands):

	Loss recognized in AOCL, net of tax				(Loss) Gain reclassified from AOCL into expense
	Twelve Months Ended December 31,				Twelve Months Ended December 31,				Location
	2020		2019		2020		2019
Interest rate swaps	$	(1,525)	$	(1,222)	$	(974)	$	399	Interest expense