Investments Realized Gain (Loss) on Investments (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Gain (Loss) on Investments [Line Items]
Realized gains and losses on securities that are not going to be held before FV recovers	$ 256,000
Realized gains and losses on securities previously impaired		$ 0	$ 51,000
Proceeds from Sale of Available-for-sale Securities, Fixed Maturities	20,638,000	0	3,074,000
Proceeds from Sale of Available-for-sale Securities, Equity	5,100,000	43,163,000	15,029,000
Gain (Loss) on Sale, Calls and Maturities of Fixed Maturities	2,024,000	(111,000)	359,000
Gain (Loss) on Sale of Equity Securities	303,000	37,000	49,000
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	(2,327,000)	74,000	(408,000)
Other Than Temporary Impairment Losses on Debt and Equity Securities	$ (4,300,000)
Number of equity securities impaired	4
Number of debt securities impaired	2
Realized loss on Other than Temporary Impairments	$ (4,312,000)	(5,385,000)	(427,000)
Realized investment gains, net	$ (1,985,000)	$ (5,459,000)	$ (19,000)
Available-for-sale Securities [Member]
Gain (Loss) on Investments [Line Items]
Number of Debt Securities Sold	11	0	2
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains	$ 1,487,000	$ 0	$ 235,000
Available-for-sale Securities, Gross Realized Losses	0	0	0
Other Than Temporary Impairment Losses on Debt and Equity Securities	(3,970,000)	(2,998,000)	0
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains	291,000	634,000	118,000
Available-for-sale Securities, Gross Realized Losses	(35,000)	(599,000)	(169,000)
Other Than Temporary Impairment Losses on Debt and Equity Securities	$ (342,000)	$ (2,387,000)	$ (427,000)
Equity Funds [Member]
Gain (Loss) on Investments [Line Items]
Number of Equity Securities Sold	5	6	3
Held-to-maturity Securities [Member]
Gain (Loss) on Investments [Line Items]
Number of Debt Securities Sold	0	0	0
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	$ 12,000	$ 111,000	$ 525