CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
CURRENT ASSETS:
Trade receivables, allowance for uncollectible accounts	$ 828	$ 464
STOCKHOLDERS' EQUITY:
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	42,424	42,008
Developed Technology Rights [Member]
OTHER ASSETS:
Intangible assets, accumulated amortization	7,354	4,759
Other Intangible Assets [Member]
OTHER ASSETS:
Intangible assets, accumulated amortization	$ 13,010	$ 10,215