Share-Based Payments (Options and Stock Appreciation Rights Outstanding) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available For Grant, Beginning Balance	291
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
Shares/Awards [Roll Forward]
Options Outstanding, Shares, Beginning Balance	82,468
Options Outstanding, Shares, Exercised	(2,850)
Options Outstanding, Shares, Forfeited	(400)
Options Outstanding, Shares, Expired	0
Options Outstanding, Shares, Granted	0
Options Outstanding, Shares, Ending Balance	79,218
Weighted-Average Exercise Price [Roll Forward]
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 186.19
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	$ 187.14
Compensation cost, liability balance	$ 4,100,000	$ 1,600,000
Total intrinsic value of options exercised	100,000	0
Total share-based liabilities paid	126,337	17,000
Total fair value of shares vested	0	0
Cash received from exercise of options	$ 300,000	$ 300,000
Stock Appreciation Rights [Member]
Shares/Awards [Roll Forward]
Options Outstanding, Shares, Beginning Balance	66,461
Options Outstanding, Shares, Exercised	(800)
Options Outstanding, Shares, Forfeited	(400)
Options Outstanding, Shares, Granted	0
Options Outstanding, Shares, Ending Balance	65,261
Weighted-Average Exercise Price [Roll Forward]
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 125.03
Options Outstanding, Weighted-Average Exercise Price, Exercised	$ 114.64
Options Outstanding, Weighted-Average Exercise Price, Forfeited	$ 251.49
Options Outstanding, Weighted-Average Exercise Price, Granted	$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 124.38