Summary of Significant Accounting Policies Deferred Acquisition Costs and Cost of Customer Relationships Acquired (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Policy Acquisition Costs and Cost of Customer Relationship Acquired [Abstract]
first year commissions, percentage of capitalized deferred acquisition costs	94.00%
New business expense, percentage of capitalized deferred acquisition costs	6.00%
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at beginning of period	$ 157,468,000.000	$ 146,691,000	$ 135,569,000
Capitalization of deferred policy acquisition costs	31,104,000	32,071,000	29,398,000
Amortization of deferred policy acquisition costs	(23,339,000)	(21,064,000)	(18,511,000)
Deferred Policy Acquisition Cost, Amortization Expense, Effect of Adjustments to Estimated Gross Profit	129,000	(230,000)	235,000
Balance at end of period	$ 165,362,000.000	$ 157,468,000.000	$ 146,691,000
Number of years of available premiums	30 years