Consolidated Statements of Stockholders' Equity (Deficit) (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]
weighted average price per treasury share withheld for taxes	$ 14.97	$ 10.91	$ 9.63