OTHER INCOME: (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OTHER INCOME, NET:
Interest and dividend income	$ 1,582	$ 1,445	$ 1,369
Gains on trading securities relating to deferred compensation plans	4,901	10,588	4,616
Interest expense	(99)us-gaap_InterestExpense	(92)us-gaap_InterestExpense	(137)us-gaap_InterestExpense
Gain on step acquisition	1,821
Impairment of equity investment		(975)	(850)
Equity method investment loss		(967)	(1,019)
Foreign exchange gains(losses)	(861)	(790)	442
Capital gains(losses)	(219)us-gaap_NonoperatingGainsLosses	2,576us-gaap_NonoperatingGainsLosses	(59)us-gaap_NonoperatingGainsLosses
Miscellaneous, net	246us-gaap_OtherNonoperatingIncomeExpense	345us-gaap_OtherNonoperatingIncomeExpense	323us-gaap_OtherNonoperatingIncomeExpense
Total other income, net	$ 7,371us-gaap_NonoperatingIncomeExpense	$ 12,130us-gaap_NonoperatingIncomeExpense	$ 4,685us-gaap_NonoperatingIncomeExpense

Represents the gain loss on trading securities relating to deferred compensation plans.

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of the cost of borrowed funds accounted for as interest expense.

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