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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
NET INCOME	$ 5,959	$ 10,365
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Unrealized gain (loss) on available-for-sale securities, net of tax of $15 and $8, respectively	54	(15)
Employee benefit plan:
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $117 and $163, respectively	422	299
Net change for employee benefit plan	422	299
Change in cumulative foreign currency translation adjustment	20	30
TOTAL OTHER COMPREHENSIVE INCOME	496	314
COMPREHENSIVE INCOME	$ 6,455	$ 10,679

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Employee Benefit Plans [Abstract]

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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