CONSOLIDATED BALANCE SHEET PARENTHETICAL (USD $)	Dec. 31, 2011	Dec. 31, 2010
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	39,840,838	39,799,252
Common stock, shares outstanding	36,278,206	36,229,615
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0