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, 2022	$ 2,655,665	$ 1,696,539	$ (6,357)	$ 968,367	$ (2,884)
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net Income	46,893			46,893
Other Comprehensive Income (Loss), Net of Tax	28				28
Contribution from Parent	5,900	5,900
Ending balance at Mar. 31, 2023	2,708,486	1,702,439	(6,357)	1,015,260	(2,856)
Beginning balance at Dec. 31, 2023	2,849,274	1,696,539	(6,357)	1,162,921	(3,829)
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Net Income	51,181			51,181
Other Comprehensive Income (Loss), Net of Tax	46				46
Ending balance at Mar. 31, 2024	$ 2,900,501	$ 1,696,539	$ (6,357)	$ 1,214,102	$ (3,783)