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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Trade accounts receivable, allowances	$ 2,521	$ 2,368
Property, plant and equipment, accumulated depreciation, depletion and amortization	$ 42,260	$ 38,273

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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