SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash paid during the year for [Abstract]
Income taxes	$ 17,662	$ 17,348	$ 12,001
Interest	84	111	214
Cash paid during the year for acquisition of assets [Abstract]
Assets acquired	0	7,313	0
Less: liabilities assumed	0	(2,652)	0
Cash paid for acquisitions	0	4,661	0
Non-cash financing activities [Abstract]
Dividends payable	$ 5,237	$ 4,311	$ 3,091

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The amount of acquisition cost of a business combination allocated to assets acquired.

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The amount of acquisition cost of a business combination allocated to liabilities assumed.

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The aggregate amount of dividends declared, but not paid, as of the financial reporting date.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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