Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, share authorized	5,000	5,000
Preferred stock, share outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, share authorized	80,000,000	80,000,000
Common stock, share issued	23,137,052	23,092,906
Common stock, share outstanding	23,137,052	23,092,906