Investments (Details Textuals) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other than Temporary Impairment Losses, Investments [Abstract]
Total other-than-temporary impairment loss			$ (2,000,000)
Portion recognized in other comprehensive income			(1,000,000)
Net other-than-temporary impairment loss recognized in earnings			1,028,000
Condition for categorizing the impaired securities	1,000,000	500,000
Condition for categorizing the impaired securities, percentage	10.00%	10.00%
Gross unrealized losses on fixed income securities	41,800,000
Weighted-average life of mortgage-backed and asset-backed securities, Years	5.3
Domestic insurance companies deposited fixed income securities (at fair value) required by state insurance departments.	39,000,000
Domestic insurance companies deposited fixed income securities (at amortized cost) required by state insurance departments.	38,700,000
Number of fixed maturity and equity securities held	2,900
Percentage of securities in unrealized loss position	24.00%
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(41,776,000)	(105,221,000)
Other-than-temporary impairment credit losses				$ 5,000,000