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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
NET INCOME	$ 43,440	$ 10,814	$ 74,914	$ 16,773
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Unrealized gain on available-for-sale securities, net of tax of $29, $32, $41 and $48	104	117	151	171
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $175, $117, $349 and $234, respectively	635	422	1,269	844
Change in cumulative foreign currency translation adjustment	(24)	(22)	9	(2)
TOTAL OTHER COMPREHENSIVE INCOME	715	517	1,429	1,013
COMPREHENSIVE INCOME	$ 44,155	$ 11,331	$ 76,343	$ 17,786

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