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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated other comprehensive income (loss)
Beginning Balance	$ 688,727
Adjust funded status of pension plan, net of tax of $0.6, $0.7 and $0.7 million for the years December 31, 2018, 2017 and 2016 respectively	(840)	$ 1,357	$ 5,251
Foreign currency translation adjustment	(4,390)	1,265	(687)
Reclassifications of gains on sale of marketable securities to net income		(1,044)
Unrealized gain on marketable securities	78	440	868
Ending Balance	695,387	688,727
Adjust funded status of pension plan, tax	600	700	700
Accumulated Other Comprehensive Income/(Loss)
Accumulated other comprehensive income (loss)
Beginning Balance	3,746	1,728	(3,704)
Adjust funded status of pension plan, net of tax of $0.6, $0.7 and $0.7 million for the years December 31, 2018, 2017 and 2016 respectively	(840)	1,357	5,251
Foreign currency translation adjustment	(4,390)	1,265	(687)
Reclassifications of gains on sale of marketable securities to net income	(203)	(1,044)
Unrealized gain on marketable securities	78	440	868
Ending Balance	(1,609)	3,746	1,728
Pension and other postretirement benefit plans
Accumulated other comprehensive income (loss)
Beginning Balance	3,127	1,770	(3,481)
Adjust funded status of pension plan, net of tax of $0.6, $0.7 and $0.7 million for the years December 31, 2018, 2017 and 2016 respectively	(840)	1,357	5,251
Ending Balance	2,287	3,127	1,770
Translation Adjustment
Accumulated other comprehensive income (loss)
Beginning Balance	355	(910)	(223)
Foreign currency translation adjustment	(4,390)	1,265	(687)
Ending Balance	(4,035)	355	(910)
Investment
Accumulated other comprehensive income (loss)
Beginning Balance	264	868
Reclassifications of gains on sale of marketable securities to net income	(203)	(1,044)
Unrealized gain on marketable securities	78	440	868
Ending Balance	$ 139	$ 264	$ 868

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

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