Condensed Consolidated Balance Sheets (Unaudited) Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Accounts receivable, allowance	$ 1,745	$ 1,444
Other acquired intangibles, accumulated amortization	$ 28,763	$ 26,028
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)	30,346,233	29,194,761
Common stock, outstanding shares (in shares)	30,346,233	29,194,761