Investments (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Investment balances
Cost	$ 73,004	$ 64,293
Gross Unrealized Gains	160	315
Gross Unrealized Losses	(65)	(54)
Estimated Market Value	73,099	64,554
U.S. Government and Government Agency Obligations
Investment balances
Cost	59,654	42,595
Gross Unrealized Gains	24	16
Estimated Market Value	59,678	42,611
Fixed Income Funds
Investment balances
Cost	3,090	10,984
Gross Unrealized Gains		99
Gross Unrealized Losses	(44)
Estimated Market Value	3,046	11,083
Money Market Funds
Investment balances
Cost	7,819	8,584
Estimated Market Value	7,819	8,584
Equity Funds
Investment balances
Cost	2,441	2,130
Gross Unrealized Gains	136	200
Gross Unrealized Losses	(21)	(54)
Estimated Market Value	$ 2,556	$ 2,276