Equity Activity - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Equity [Abstract]
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	90,000,000	90,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares outstanding	15,298,465	15,129,239
Warrants issued				789,474
Warrants, exercise price				52.8
Warrants exercised (shares)	96,444	0	0