Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	112,727,000	112,599,000
Common stock, shares outstanding	112,727,000	112,599,000
Total assets	$ 111,500	$ 138,200
Total liabilities	63,600	62,400
Variable Interest Entities [Member]
Total assets	111,500	109,200
Total liabilities	$ 63,600	$ 61,900