Earnings Per Share (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended		38 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2014
Earnings Per Share [Abstract]
Common stock repurchased, shares	8,529	16,201	40,600
Common stock repurchased, average price per share	$ 109.38	$ 89.20	$ 82.61
Common stock repurchased, value	$ 932,900	$ 1,445,044	$ 3,400,000