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Consolidated Statements of Income and Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Consolidated Statements Of Income And Comprehensive Income    
Unrealized gain (losses) on investments, net of taxes $ (23) $ 23
Temporary impairment of investments, net of taxes $ (76)
Realized (gains) losses on investments, net of taxes $ 2