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Stock-based Compensation (Stock Option Expenses) (Details) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Granted, shares			14,716
Stock-based compensation	$ 329	$ 519	$ 769	$ 1,013
Income tax benefit	19,211	19,287	32,000	33,500
Restricted Stock [Member]
Stock-based compensation	711	692	1,100	1,144
Stock Options [Member]
Granted, shares			0
Additional income tax expense	52
Income tax benefit	46	149	420	301
Adjustment to compensation expense	$ 644

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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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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