Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	$ 4,119	$ 5,196
Municipal Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	4,119	5,196
Amortized Cost, Due from one through five years	15,413	17,636
Amortized Cost, Due from six through ten years	10,367	7,388
Amortized Cost, Due from eleven through twenty years	743	0
Amortized Cost, Total	30,642	30,220
Market Value, Current	4,192	5,264
Market Value, Due from one through five years	16,315	18,527
Market Value, Due from six through ten years	10,773	7,777
Market Value, Due from eleven through twenty years	749	0
Market Value, Total	$ 32,029	$ 31,568