Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current Expense, Domestic	$ 239,090	$ 162,305	$ 124,231
Deferred Expense (Benefit), Domestic	2,752	17	27,616
Domestic, Total	241,842	162,322	151,847
Current Expense, Foreign	0	23,375	9,030
Deferred Expense (Benefit), Foreign	10,048	(13,880)	8,058
Foreign, Total	10,048	9,495	17,088
Current Expense, Total	239,090	185,680	133,261
Deferred Expense (Benefit), Total	12,800	(13,863)	35,674
Total expense	251,890	171,817	168,935
Income (Loss) from Continuing Operations before Income Taxes, Domestic	1,224,000	831,000	739,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 59,000	$ (126,000)	$ 114,000