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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 85,887 $ 41,600 $ 38,415
Other comprehensive (loss) income      
Unrealized holding (losses) gains, net of tax (549) 34 (163)
Comprehensive income $ 85,338 $ 41,634 $ 38,252