Share-Based Payments (Options and Stock Appreciation Rights Outstanding) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available For Grant, Beginning Balance	291,000
Shares Available For Grant, Exercised	0
Shares Available For Grant, Forfeited	0
Shares Available For Grant, Expired	0
Shares Available For Grant, Granted	0
Shares Available For Grant, Ending Balance	291,000
Shares/Awards [Roll Forward]
Options Outstanding, Shares, Beginning Balance	36,668
Options Outstanding, Shares, Exercised	(3,000)
Options Outstanding, Shares, Forfeited	(250)
Options Outstanding, Shares, Expired	0
Options Outstanding, Shares, Granted	0
Options Outstanding, Shares, Ending Balance	33,418
Weighted-Average Exercise Price [Roll Forward]
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 229.24
Options Outstanding, Weighted-Average Exercise Price, Exercised	$ 150.00
Options Outstanding, Weighted-Average Exercise Price, Forfeited	$ 255.13
Options Outstanding, Weighted-Average Exercise Price, Expired	$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Granted	$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 236.16
Compensation cost, liability balance	$ 7,100,000	$ 4,100,000
Total intrinsic value of options exercised	500,000	100,000
Total share-based liabilities paid	500,000	100,000
Cash received from exercise of options	400,000	300,000
Total fair value of shares vested	$ 0	$ 0
Stock Appreciation Rights [Member]
Shares/Awards [Roll Forward]
Options Outstanding, Shares, Beginning Balance	99,461
Options Outstanding, Shares, Exercised	(1,475)
Options Outstanding, Shares, Forfeited	(1,400)
Options Outstanding, Shares, Granted	0
Options Outstanding, Shares, Ending Balance	96,586.000
Weighted-Average Exercise Price [Roll Forward]
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 156.93
Options Outstanding, Weighted-Average Exercise Price, Exercised	$ 114.64
Options Outstanding, Weighted-Average Exercise Price, Forfeited	$ 158.38
Options Outstanding, Weighted-Average Exercise Price, Granted	$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 157.56