Consolidated Statements of Stockholders' Equity (Parenthetical) (Retained Earnings [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Retained Earnings [Member]
Stockholders dividends per share	$ 3.50	$ 3.50	$ 3.50
Anti-dilution adjustment paid to stock plan participants per share	$ 3.00	$ 3.00	$ 3.00