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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 7,233	$ 14,200
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in each of the three months ended March 31, 2019 and 2018	(22)	(37)
Unrealized gain (loss) on marketable securities, net of $0 tax in each of the three months ended March 31, 2019 and 2018	334	(238)
Amortization of defined benefit pension items, net of tax of $5 and $9 in the three months ended March 31, 2019 and 2018, respectively	16	32
Total other comprehensive income (loss)	328	(243)
TOTAL COMPREHENSIVE INCOME	$ 7,561	$ 13,957

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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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