CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	74,000,000	74,000,000
Common stock, shares issued	17,759,279	15,895,348
Common stock, shares outstanding	17,759,279	15,895,348
Class A common stock
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	14,870,673	16,603,173
Common stock, shares outstanding	14,870,673	16,603,173