Condensed Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	30,343,556	30,041,584
Common stock, shares outstanding	30,343,556	30,041,584
Allowance for Doubtful Accounts Receivable, Current	$ 4,678	$ 4,080