Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Derivative Financial Instruments (Details) - Interest rate swap agreement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jun. 12, 2017
Derivative instruments
Losses resulted from changes in fair values of the interest rate swap agreement	$ 16	$ 7
Line of credit
Derivative instruments
Interest rate swap agreement				$ 8,000
Prepaid Expenses and Other Current Assets
Derivative instruments
Fair values of interest rate swap agreement	$ 50		$ 80