Condensed Financial Information Of Parent Company Parent Company Information (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Investment Income, Dividend									$ 4,046	$ 3,613	$ 1,604
Interest Expense	$ 14,298	$ 15,152	$ 15,903	$ 15,239	$ 14,713	$ 13,510	$ 11,830	$ 2,345	60,592	42,398	12,201
Income Tax Expense (Benefit)	(49,380)	(39,777)	(45,287)	(46,073)	(43,261)	(42,911)	(15,552)	(15,281)	(180,517)	(117,005)	(32,525)
Net earnings	$ 71,841	$ 69,616	$ 85,083	$ 73,079	$ 70,999	$ 62,271	$ 10,555	$ 25,080	299,619	168,905	45,115
Parent Only
Condensed Financial Statements, Captions [Line Items]
Other Income									1,458	122	104
Acquisition Related Securities Gain									0	0	5,222
Investment Income, Dividend									214,000	137,000	48,000
Total Income									215,458	137,122	53,326
Interest Expense									4,279	4,211	3,796
Operating Expenses									6,983	8,105	6,061
Total Expenses									11,262	12,316	9,857
Net earnings from continuing operations									204,196	124,806	43,469
Income Tax Expense (Benefit)									4,225	5,164	4,038
Income Loss From Continuing Operations Before Income Loss From Equity Method Investments									208,421	129,970	47,507
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions									91,198	38,935	(2,392)
Net earnings									$ 299,619	$ 168,905	$ 45,115