CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDER'S EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital Stock Expense	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2021	$ 2,531,209	$ 1,696,539	$ (6,357)	$ 850,942	$ (9,915)
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net Income	74,394			74,394
Other Comprehensive Income, Net of Tax	394				394
Ending balance at Jun. 30, 2022	2,605,997	1,696,539	(6,357)	925,336	(9,521)
Beginning balance at Mar. 31, 2022	2,550,826	1,696,539	(6,357)	870,362	(9,718)
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net Income	54,974			54,974
Other Comprehensive Income, Net of Tax	197				197
Ending balance at Jun. 30, 2022	2,605,997	1,696,539	(6,357)	925,336	(9,521)
Beginning balance at Dec. 31, 2022	2,655,665	1,696,539	(6,357)	968,367	(2,884)
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net Income	94,619			94,619
Other Comprehensive Income, Net of Tax	55				55
Dividend Declared to Parent	(55,000)			(55,000)
Contribution from Parent	5,900	5,900
Ending balance at Jun. 30, 2023	2,701,239	1,702,439	(6,357)	1,007,986	(2,829)
Beginning balance at Mar. 31, 2023	2,708,486	1,702,439	(6,357)	1,015,260	(2,856)
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net Income	47,726			47,726
Other Comprehensive Income, Net of Tax	27				27
Dividend Declared to Parent	(55,000)			(55,000)
Ending balance at Jun. 30, 2023	$ 2,701,239	$ 1,702,439	$ (6,357)	$ 1,007,986	$ (2,829)