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LONG-TERM LIABILITIES - Schedule of Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities [Abstract]
Capital lease obligations	$ 2,363	$ 837
Deferred rent	3,039	1,359
Restructuring	979	10,176
Pension obligations	7,006	7,524
Taxes payable	1,818	2,079
Deferred purchase consideration	30,000	0
Other	2,425	2,544
Long-term liabilities	47,630	24,519
Current portion	(16,833)	(11,330)
Long-term liabilities, net of current portion	$ 30,797	$ 13,189

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Deferred Payments to Acquire Businesses

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Other Liabilities Including Restructuring, Current

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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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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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