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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Investment Income, Dividend									$ 1,646	$ 1,739	$ 1,866
Total Income									1,362,455	1,310,305
Interest Expense	$ 46,974	$ 54,972	$ 53,635	$ 49,683	$ 40,974	$ 32,325	$ 26,182	$ 21,275	205,264	120,756	72,945
Income Tax Expense (Benefit)	(29,186)	(41,830)	(50,239)	(43,049)	$ (39,015)	$ (41,289)	$ (42,286)	$ (45,388)	(164,304)	(167,978)	(196,913)
Net earnings	$ 117,881	$ 110,026	$ 128,125	$ 112,604					468,636	465,339	357,818
Parent Only
Condensed Financial Statements, Captions [Line Items]
Other Income									9,739	8,358	3,393
Investment Income, Dividend									336,000	684,000	265,000
Total Income									345,739	692,358	268,393
Interest Expense									6,637	6,550	5,519
Operating Expenses									9,833	10,068	8,273
Total Expenses									16,470	16,618	13,792
Net earnings from continuing operations									329,269	675,740	254,601
Income Tax Expense (Benefit)									2,202	7,262	19,957
Income Loss From Continuing Operations Before Income Loss From Equity Method Investments									331,471	683,002	274,558
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions									137,165	(217,663)	83,260
Net earnings									$ 468,636	$ 465,339	$ 357,818