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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]    
Unrealized gain (losses) on investments, net of taxes $ 38 $ 30
Temporary impairment of investments, net of taxes 0 84
Realized (gains) losses on investments, net of taxes $ 6 $ (28)