Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Common stock, shares issued under stock option plans	17,510	0
Tax benefit on exercise of stock options	$ 34	$ 0
Common stock, shares issued under employee stock purchase plan (shares)	30	30
Common stock, shares issued in connection with dividend reinvestment and stock purchase plan (shares)	1,934	3,433