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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
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			86,118
Options Outstanding, Shares, Exercised			0
Options Outstanding, Shares, Forfeited			(3,050)
Options Outstanding, Shares, Expired			0
Options Outstanding, Shares, Granted			0
Options Outstanding, Shares, Ending Balance	83,068		83,068
Weighted-Average Exercise Price [Roll Forward]
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance			$ 187.83
Options Outstanding, Weighted-Average Exercise Price, Exercised			$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Forfeited			$ 218.94
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	$ 186.69		$ 186.69
Compensation cost, liability balance	$ 2,000,000	$ 1,700,000	$ 2,000,000	$ 1,700,000
Total intrinsic value of options exercised			66,000	557,000
Total share-based liabilities paid	66,000	179,000	66,000	179,000
Total fair value of shares vested			400,000	600,000
Cash received from exercise of options	$ 0	$ 0
Stock Appreciation Rights [Member]
Shares/Awards [Roll Forward]
Options Outstanding, Shares, Beginning Balance			75,411
Options Outstanding, Shares, Exercised			(2,700)
Options Outstanding, Shares, Forfeited			(2,250)
Options Outstanding, Shares, Granted			0
Options Outstanding, Shares, Ending Balance	70,461		70,461
Weighted-Average Exercise Price [Roll Forward]
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance			$ 126.64
Options Outstanding, Weighted-Average Exercise Price, Exercised			$ 121.28
Options Outstanding, Weighted-Average Exercise Price, Forfeited			$ 149.57
Options Outstanding, Weighted-Average Exercise Price, Granted			$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 126.11		$ 126.11