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Stock-Based Compensation (Stock Option Expenses) (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit	$ 24,703	$ 25,728	$ 56,303	$ 58,573
Granted, shares			14,176
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	351	412	1,451	1,555
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	337	526	1,105	1,540
Income tax benefit	141	201	561	502
Granted, shares			0
Adjustment to compensation expense	644
Additional income tax expense	$ 52

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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