Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2011
Statement of Financial Position [Abstract]
Allowances for accounts receivable	$ 633	$ 812
Preferred stock, par value
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	58,033,521	58,153,665
Common stock, shares outstanding	58,033,521	58,153,665