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REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS (Schedule of Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Trade accounts payable and accrued expenses	$ 28,900		$ 32,422
Deferred revenue from contracts with customers	6,674	$ 9,308	6,950
Deferred taxes			1,402
Retained earnings	$ 338,753		321,323
Adjustments due ASC 606 [Member]
Trade accounts payable and accrued expenses			(4,000)
Deferred revenue from contracts with customers			6,950
Deferred taxes			(723)
Retained earnings			(2,227)
After Adjustment [Member]
Trade accounts payable and accrued expenses			28,422
Deferred revenue from contracts with customers			6,950
Deferred taxes			679
Retained earnings			$ 319,096

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- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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