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Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, All Other Investments [Abstract]  
Summary of Investments
The following table summarizes activities related to these investments for the three months ended March 31, 2022 and the twelve months ended December 31, 2021 (in thousands):
Three Months Ended March 31, 2022Twelve Months Ended December 31, 2021
Fair value at beginning of period$38,670 $25,708 
Purchases8,450 26,980 
Redemptions(400)(6,530)
Maturities (1,970)(8,347)
Change in bond premium206 1,517 
Fair market value adjustment(1,291)(658)
Fair value at end of period$43,665 $38,670 
Summary of Outstanding Interest Rate Swaps
The following table summarizes our outstanding interest rate swaps and their classification in the accompanying Condensed Consolidated Balance Sheets at March 31, 2022 and December 31, 2021 (in thousands):
March 31, 2022
Notional
Amount		Fair
Value		Balance Sheet Location
Interest rate swap$20,000 $(32)Other current liability
Interest rate swap$15,000 $(128)Other non-current liability
Interest rate swaps$80,000 $3,738 Other non-current assets
December 31, 2021
Notional
Amount		Fair
Value		Balance Sheet Location
Interest rate swap$20,000 $(120)Other current liability
Interest rate swaps$45,000 $(496)Other non-current liabilities
Interest rate swap$50,000 $405 Other non-current asset
Summary of Effects of Interest Rate Swap
The following table summarizes the effects of the interest rate swaps on the accompanying Condensed Consolidated Statements of Comprehensive Income for the three months ended March 31, 2022 and 2021 (in thousands):
Gain Recognized
in AOCI, net of tax		Loss Reclassified
from AOCL into Expense
Three Months Ended
March 31,		Three Months Ended
March 31,
2022202120222021
Interest rate swaps$2,607 $961 $(343)$(285)