CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement Of Stockholders' Equity [Abstract]
Issuance of common stock to non-employee directors, shares	4,737	6,840	7,835
Exercise of stock options, shares	153,775	468,204	74,125
Repurchase of common stock, shares		1,184,200
Dividends paid, per share (in dollars per share)	$ 0.52	$ 0.48	$ 0.10