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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
NET INCOME (LOSS) $ 13,520 $ (1,500) $ 71,072 $ 22,251
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:        
Unrealized gain (loss) on available-for-sale securities, net of tax of $14, $92, $64 and $139, respectively 27 (171) 117 (256)
Employee benefit plan:        
Actuarial (loss) gain, net of tax of $154, $(5), $1,060 and $195, respectively (283) (5) (1,945) (358)
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $199, $141, $549 and $443, respectively 365 278 1,007 814
Net change for employee benefit plan 82 273 (938) 456
Change in cumulative foreign currency translation adjustment 3 12 28 32
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) 112 114 (793) 232
COMPREHENSIVE INCOME (LOSS) $ 13,632 $ (1,386) $ 70,279 $ 22,483