Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Assets

As of December 31, 2021 and 2020, the Company had the following assets measured at fair value on a recurring basis:

	Fair Value Measurements at Reporting Date Using
(in thousands)	Total		Level 1		Level 2		Level 3
December 31, 2021
Mutual funds(1)	$	33,555	$	33,555	$	—	$	—
Money market funds(1)	2,520		—		2,520		—
Total	$	36,075	$	33,555	$	2,520	$	—
December 31, 2020
Mutual funds(1)	$	28,520	$	28,520	$	—	$	—
Money market funds(1)	2,836		—		2,836		—
Total	$	31,356	$	28,520	$	2,836	$	—

(1) Included in Investments, employee benefit plans, at fair value and other current assets on the consolidated balance sheets.

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

At December 31, 2021 and December 31, 2020, the carrying amounts and fair values are as follows:

	December 31, 2021				December 31, 2020
(in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
2020 Senior Notes	$	444,470	$	477,675	$	443,860	$	498,290
2019 Senior Notes	395,237		425,984		394,635		438,104
2012 Senior Notes	216,351		221,702		215,827		232,381