Condensed Consolidated Balance Sheets (Unaudited) Parenthetical (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Accounts receivable, allowance	$ 1,456	$ 1,996
Other acquired intangibles, accumulated amortization	$ 20,314	$ 16,871
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	50,000,000	50,000,000
Common stock, issued shares (in shares)	28,476,942	29,030,919
Common stock, outstanding shares (in shares)	28,476,942	29,030,919