CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Redeemable preferred stock, par value	$ 0.0001	$ 0.0001
Redeemable preferred stock, shares authorized	20,000	20,000
Redeemable preferred stock, shares issued	3,319	3,319
Redeemable preferred stock, shares outstanding	3,319	3,319
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	97,098	96,703
Common stock, shares outstanding	97,098	96,703
Treasury stock, shares	19	19