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Investments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Current $ 4,602 $ 5,196
Municipal Bonds [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Current 4,602 5,196
Due from one through five years 17,228 17,636
Due from six through ten years 11,341 7,388
Due from eleven through twenty years 1,116 0
Total 34,287 30,220
Current 4,635 5,264
Due from one through five years 18,158 18,527
Due from six through ten years 11,751 7,777
Due from eleven through twenty years 1,121 0
Total $ 35,665 $ 31,568