Financial Instruments and Fair Value Disclosures (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Assets Measured at Fair Value on Nonrecurring and Recurring Basis

Assets and liabilities measured at fair value are summarized below (in thousands).

	Successor
	December 31, 2023
	Fair Value Measurements Using
	Level 1			Level 2		Level 3		Assets and Liabilities at Fair Value			Total Losses for Year Ended (2)
Recurring fair value measurements
Short-term investments (1)	$	92,308		$	—	$	—	$	92,308		$	—
Liability-classified Director restricted stock units (2)	$	(1,259	)	$	—	$	—	$	(1,259	)	$	(252	)

	Successor
	December 31, 2022
	Fair Value Measurements Using
	Level 1			Level 2		Level 3		Assets and Liabilities at Fair Value			Total Losses for Year Ended (2)
Recurring fair value measurements
Liability-classified Director restricted stock units (2)	$	(1,258	)	$	—	$	—	$	(1,258	)	$	(201	)

(1)Represents short-term investments in debt securities classified as available for sale. As the original maturities of these debt securities are three months or less, we have reported our $92.3 million investment in these debt securities as Cash and cash equivalents in our Consolidated Balance Sheets at December 31, 2023.

(2)The fair value of restricted stock units was estimated based on the quoted market price of our Common Stock at the respective balance sheet date. The total loss for the year includes an increase in stock compensation expense due to the “marking-to-market” of liability-classified restricted stock units granted to our non-employee directors on a recurring basis.

Fair Values and Related Carrying Values of Our Debt Instruments

Fair values and related carrying values of our Second Lien Notes, Exit Term Loans and First Lien Notes (see Note 10 "Long-Term Debt") are shown below (in millions).

	December 31,
	2023				2022
	Fair Value		Carrying Value		Fair Value		Carrying Value
Second Lien Notes	$	562.6	$	550.0	$	—	$	—
Exit Term Loans		—		—		91.1		100.0
First Lien Notes		—		—		78.3		85.3