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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated other comprehensive income (loss) |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | $ 680,299 |  |
Adjust funded status of pension plan, net of tax | 5,251 | $ (809) | $ (724)
Adjust funded status of pension plan, tax | 700 | 700 | 600
Foreign currency translation adjustment | (687) | 26 | 4
Unrealized Gain on Marketable Securities | 868 |  |
Stockholders' Equity Attributable to Parent, Ending Balance | 677,055 | 680,299 |
Short Term Investments |  |  |
Accumulated other comprehensive income (loss) |  |  |
Unrealized Gain on Marketable Securities | 868 |  |
Stockholders' Equity Attributable to Parent, Ending Balance | 868 |  |
Projected Pension Benefit Obligation |  |  |
Accumulated other comprehensive income (loss) |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | (3,481) | (2,672) | (1,949)
Adjust funded status of pension plan, net of tax | 5,251 | (809) | (723)
Stockholders' Equity Attributable to Parent, Ending Balance | 1,770 | (3,481) | (2,672)
Amounts reclassified from accumulated other comprehensive income, net of tax | 1,300 | 200 | 200
Translation Adjustment |  |  |
Accumulated other comprehensive income (loss) |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | (223) | (249) | (253)
Foreign currency translation adjustment | (687) | 26 | 4
Stockholders' Equity Attributable to Parent, Ending Balance | (910) | (223) | (249)
Accumulated Other Comprehensive Income/(Loss) |  |  |
Accumulated other comprehensive income (loss) |  |  |
Stockholders' Equity Attributable to Parent, Beginning Balance | (3,704) | (2,921) | (2,202)
Adjust funded status of pension plan, net of tax | 5,251 | (809) | (723)
Foreign currency translation adjustment | (687) | 26 | 4
Unrealized Gain on Marketable Securities | 868 |  |
Stockholders' Equity Attributable to Parent, Ending Balance | $ 1,728 | $ (3,704) | $ (2,921)

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