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LONG-TERM LIABILITIES - Schedule of Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities [Abstract]
Finance lease obligations	$ 3,149
Finance lease obligations		$ 2,363
Deferred rent	0	3,039
Restructuring	3,510	979
Pension obligations	9,954	7,006
Taxes payable	1,991	1,818
Deferred purchase consideration	0	30,000
Other	1,683	2,425
Long-term liabilities	20,287	47,630
Current portion	(3,698)	(16,833)
Long-term liabilities, net of current portion	$ 16,589	$ 30,797

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Deferred Payments to Acquire Businesses

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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