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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
NET INCOME $ 47,187 $ 21,802 $ 57,552 $ 23,751
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:        
Unrealized gain (loss) on available-for-sale securities, net of tax of $58, $37, $50 and $47, respectively 105 67 90 (84)
Employee benefit plan:        
Actuarial (loss) gain, net of tax of $906, $271, $906 and $200, respectively (1,662) 479 (1,662) (353)
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $187, $142, $350 and $302, respectively 343 254 642 535
Net change for employee benefit plan (1,319) 733 (1,020) 182
Change in cumulative foreign currency translation adjustment (5) 20 25 20
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME (1,219) 820 (905) 118
COMPREHENSIVE INCOME $ 45,968 $ 22,622 $ 56,647 $ 23,869