Condensed Financial Information Of Parent Company Parent Company Information (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Investment Income, Dividend									$ 2,575	$ 4,046	$ 3,613
Interest Expense	$ 13,468	$ 13,220	$ 13,297	$ 14,636	$ 14,298	$ 15,152	$ 15,903	$ 15,239	54,621	60,592	42,398
Income Tax Expense (Benefit)	(49,716)	(48,479)	(49,726)	(57,849)	$ (49,380)	$ (39,777)	$ (45,287)	$ (46,073)	(205,770)	(180,517)	(117,005)
Net earnings	$ 85,647	$ 93,895	$ 82,168	$ 90,456					352,166	299,619	168,905
Parent Only
Condensed Financial Statements, Captions [Line Items]
Other Income									2,146	1,458	122
Investment Income, Dividend									259,000	214,000	137,000
Total Income									261,146	215,458	137,122
Interest Expense									4,816	4,279	4,211
Operating Expenses									7,732	6,983	8,105
Total Expenses									12,548	11,262	12,316
Net earnings from continuing operations									248,598	204,196	124,806
Income Tax Expense (Benefit)									2,612	4,225	5,164
Income Loss From Continuing Operations Before Income Loss From Equity Method Investments									251,210	208,421	129,970
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions									100,956	91,198	38,935
Net earnings									$ 352,166	$ 299,619	$ 168,905