Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balance, beginning of period at Dec. 31, 2022	$ 2,263,153	$ 79,683	$ 2,294,797	$ (208,979)	$ 97,652
Balance, beginning of period (shares) at Dec. 31, 2022		79,683,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	16,260			16,260
Shares issued for stock compensation		$ 233	(233)
Shares issued for stock compensation (shares)		233,000
Equity-based compensation expense	2,279		2,279
Pension plans and OPEB obligations, net of tax	(131)				(131)
Cash flow hedges, net of tax	(17,335)				(17,335)
Common dividends	(35,962)			(35,962)
Other transactions, net	(1)		84	(85)
Balance, end of period at Mar. 31, 2023	2,228,263	$ 79,916	2,296,927	(228,766)	80,186
Balance, end of period (shares) at Mar. 31, 2023		79,916,000
Balance, beginning of period at Dec. 31, 2023	$ 2,171,098	$ 79,365	2,303,992	(315,291)	103,032
Balance, beginning of period (shares) at Dec. 31, 2023	79,365,000	79,365,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (305)			(305)
Shares issued for stock compensation		$ 143	(143)
Shares issued for stock compensation (shares)		143,000
Equity-based compensation expense	2,560		2,560
Pension plans and OPEB obligations, net of tax	(229)				(229)
Cash flow hedges, net of tax	15,925				15,925
Common dividends	(35,779)			(35,779)
Other transactions, net	2		90	(88)
Balance, end of period at Mar. 31, 2024	$ 2,153,272	$ 79,508	$ 2,306,499	$ (351,463)	$ 118,728
Balance, end of period (shares) at Mar. 31, 2024	79,508,000	79,508,000