Condensed Financial Information Of Parent Company Condensed Financial Information Of Parent Company (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Investment Income, Dividend									$ 1,573	$ 1,646	$ 1,739
Total Income									1,249,551	1,362,455	1,310,305
Interest Expense	$ 12,968	$ 14,584	$ 19,796	$ 41,585	$ 46,974	$ 54,972	$ 53,635	$ 49,683	88,933	205,264	120,756
Income Tax Expense (Benefit)	(36,546)	(13,671)	(12,968)	(11,988)	(29,186)	(41,830)	(50,239)	(43,049)	(75,173)	(164,304)	(167,978)
Net earnings (loss)	$ 116,830	$ 45,503	$ 33,204	$ (1,433,111)	$ 117,881	$ 110,026	$ 128,125	$ 112,604	(1,237,574)	468,636	465,339
Parent Only
Condensed Financial Statements, Captions [Line Items]
Other Income									14,276	9,739	8,358
Investment Income, Dividend									258,000	336,000	684,000
Total Income									272,276	345,739	692,358
Interest Expense									4,394	6,637	6,550
Operating Expenses									11,184	9,833	10,068
Total Expenses									15,578	16,470	16,618
Net earnings from continuing operations									256,698	329,269	675,740
Income Tax Expense (Benefit)									(3,268)	2,202	7,262
Income Loss From Continuing Operations Before Income Loss From Equity Method Investments									253,430	331,471	683,002
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions									(1,491,004)	137,165	(217,663)
Net earnings (loss)									$ (1,237,574)	$ 468,636	$ 465,339