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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 65,991 $ 39,390 $ 28,004
Other comprehensive income:      
Unrealized loss on available-for-sale securities, net of tax (3) (3) (26)
Comprehensive income $ 65,988 $ 39,387 $ 27,978