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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Change in unrealized investment gains (losses), tax amount $ 1,178,000 $ 0 $ 2,390,000
Reclassification adjustment from AOCI for sale of securities, tax $ 0 $ 0 $ 0