Consolidated Statements of Stockholders' (Deficit) Equity (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Stockholders' Equity [Abstract]
weighted average price per treasury share withheld for taxes	$ 10.91	$ 9.63	$ 12.41