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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data	Sep. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 279	$ 228
Property and equipment, accumulated depreciation	56,565	48,223
Intangible assets, accumulated amortization	$ 9,552	$ 4,019
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	2,000	2,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	32,060	31,852
Common stock, shares outstanding	32,060	31,852
Treasury stock, shares	2,436	2,436

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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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