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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Consolidated Statements Of Income And Comprehensive Income      
Unrealized gain (losses) on investments, net of taxes $ 30 $ 94 $ (50)
Temporary impairment of investments, net of taxes 84
Realized (gains) losses on investments, net of taxes $ (28) $ 39 $ 85