Stock Incentive Plans (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of stock options activity
Stock options shares at beginning of year	1,162,000	1,252,000	1,207,000
Stock option, Weighted Average Exercise Price Beginning balance	$ 46.4	$ 42.12	$ 39.45
Options granted, number of shares	0	332,000	289,000
Option granted, Weighted Average Exercise Price	$ 0	$ 57.33	$ 49.17
Option exercises, Shares	213,724	341,000	232,000
Option exercised, Weighted Average Exercise Price	$ 42.16	$ 40.11	$ 36.92
Options terminated, number of shares	(14,000)	(81,000)	(12,000)
Option terminated, Weighted Average Exercise Price	$ 48.09	$ 51.81	$ 43.09
Stock options shares at End of year	934,000	1,162,000	1,252,000
Stock option, Weighted Average Exercise Price Ending balance	$ 47.35	$ 46.4	$ 42.12
Options exercisable at end of period, Aggregate Intrinsic Value	$ 6,855,000
Options exercisable at end of period, Number of Shares	421,000	313,000	427,000
Options exercisable at end of period Weighted Average Exercise Price	$ 43.99	$ 40.82	$ 39.45
Weighted average fair value of options granted during the period, Weighted Average Exercise Price	$ 0	$ 11.11	$ 9.6