Investments Realized Gains (Losses) on Investments (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016 USD ($)	Jun. 30, 2016	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Gain (Loss) on Investments [Line Items]
Proceeds from Sale of Available-for-sale Securities, Debt	$ 0		$ 0	$ 0	$ 0
Proceeds from Sale of Available-for-sale Securities, Equity	$ 0		0	$ 403	$ 0
Sale of bonds, number of securities sold at a loss	0			0	0
Number of Equity Securities Sold		1
Number of mutual funds sold		3
Sale of bonds, number of held-to-maturity bonds sold	0			0	0
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains	$ 0			$ 0	$ 0
Available-for-sale Securities, Gross Realized Losses	0			0
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains	0		0	40	0
Available-for-sale Securities, Gross Realized Losses	$ 0		$ 0	$ 36	$ 0