Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current Expense, Domestic	$ 124,231	$ 188,712	$ 225,694
Deferred Expense (Benefit), Domestic	27,616	(63,134)	(27,601)
Domestic, Total	151,847	125,578	198,093
Current Expense, Foreign	9,030	13,963	8,803
Deferred Expense (Benefit), Foreign	8,058	23,487	12,537
Foreign, Total	17,088	37,450	21,340
Current Expense, Total	133,261	202,675	234,497
Deferred Expense (Benefit), Total	35,674	(39,647)	(15,064)
Total expense	168,935	163,028	219,433
Income (Loss) from Continuing Operations before Income Taxes, Domestic	739,000	755,000	797,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 114,000	$ 57,000	$ (25,000)