Summary of Significant Accounting Policies Cost of Customer Relationships Acquired (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Number of years of available premiums	50 years
Total	$ 19,415	$ 21,585	$ 23,542	$ 23,374
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, Additions	0	0	2,762
Intangibles Assets Arising from Insurance Contracts Acquired in Business Combination, Amortization Expense	(2,063)	(2,317)	(2,182)
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, Period Increase (Decrease)	$ (107)	$ 360	$ (412)
Number of Years-Cost of Customer Relationship Acquired Amortization	5 years
2017	$ 1,791
2018	1,658
2019	1,495
2020	1,349
2021	1,220
Thereafter	12,461
Net	19,974
Effects of unrealized (gains) losses on CCRA	$ (559)
Customer Relationships [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	3.70%
Customer Relationships [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	8.50%