Share-Based Payments (Options and Stock Appreciation Rights Outstanding) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 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		291,000
Shares/Awards [Roll Forward]
Options Outstanding, Shares, Beginning Balance			36,668
Options Outstanding, Shares, Exercised			(5,000)
Options Outstanding, Shares, Forfeited			(400)
Options Outstanding, Shares, Expired			0
Options Outstanding, Shares, Granted			0
Options Outstanding, Shares, Ending Balance	31,268		31,268
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	$ 241.58		$ 241.58
Compensation cost, liability balance	$ 7,700,000	$ 4,400,000	$ 7,700,000	$ 4,400,000
Total intrinsic value of options exercised			700,000	1,300,000
Total share-based liabilities paid			600,000	1,300,000
Cash received from exercise of options			600,000	400,000
Total fair value of shares vested	$ 200,000	$ 0
Stock Appreciation Rights [Member]
Shares/Awards [Roll Forward]
Options Outstanding, Shares, Beginning Balance			99,461
Options Outstanding, Shares, Exercised			(1,675)
Options Outstanding, Shares, Forfeited			(1,400)
Options Outstanding, Shares, Granted			0
Options Outstanding, Shares, Ending Balance	96,386.000		96,386.000
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	$ 157.64		$ 157.64