Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Receivable from related party	$ 123	$ 223
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	230	230
Common stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	200,000	200,000
Common stock, outstanding shares	98,379	85,543
Class A common stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	30,000	30,000