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Shareholders' Equity (Stock-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 15,736	$ 14,112	$ 26,783
Less: Deferred tax benefit	(5,650)	(5,332)	(10,068)
Stock-based compensation expense, net of tax	$ 10,086	$ 8,780	$ 16,715

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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