Investments Realized Gains (Losses) on Investments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Gain (Loss) on Investments [Line Items]
Proceeds from Sale of Available-for-sale Securities, Debt	$ 0	$ 100	$ 0	$ 680
Proceeds from Sale of Available-for-sale Securities, Equity	$ 0	3,924	$ 0	$ 15,029
Sale of bonds, number of securities sold at a loss	0			0
Sale of bonds, number of held-to-maturity bonds sold	0		0	0
Equity Funds [Member]
Gain (Loss) on Investments [Line Items]
Number of Equity Securities Sold				1
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains	$ 0	5	$ 0	$ 26
Available-for-sale Securities, Gross Realized Losses	0	0	0	0
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains	0	55	0	118
Available-for-sale Securities, Gross Realized Losses	$ 0	$ 0	$ 0	$ 169