Income Taxes Changes in Net Deferred Tax Liability (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Deferred Income Tax Expense (Benefit)	$ 9,834,000	$ (3,557,000)
Available-for-sale Securities, Income Tax Expense on Change in Unrealized Holding Gain (Loss)	(128,000)	6,695,000
Deferred Tax from Change in Unrealized Gain Loss Atributible to Deferred Acquisition Costs and Value of Business Acquired	18,000	(115,000)
Deferred tax assets, net	76,869,000	$ 67,145,000	$ 64,122,000
Deferred Tax Assets, Capital Loss Carryforwards	0
Operating Loss Carryforwards	$ 0