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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 Income And Comprehensive Income [Abstract]      
NET INCOME $ 48,070 $ 14,678 $ 41,854
OTHER COMPREHENSIVE LOSS, NET OF TAX:      
Unrealized loss on available-for-sale securities, net of tax of $72, $46, and $3, respectively (135) (83) (4)
Employee benefit plan:      
Actuarial loss on retirement plan, net of tax of $945, $218, and none, respectively (1,731) (388) (385)
Plan amendment cost, net of tax of none, $3,305, and none, respectively   (5,963)  
Amortization of plan amendment cost, prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $591, $553, and $209, respectively 1,084 997 375
Net change for employee benefit plan (647) (5,354) (10)
Change in cumulative foreign currency translation adjustment (65)    
TOTAL OTHER COMPREHENSIVE LOSS (847) (5,437) (14)
COMPREHENSIVE INCOME $ 47,223 $ 9,241 $ 41,840