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Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock-based compensation expense
Stock-based compensation expense (income), net of tax	$ 4,887	$ 6,847
Stock-based compensation expense per basic and diluted share (in dollars per share)	$ 0.03	$ 0.04
Stock-based compensation	5,710	9,800
Excess tax benefits from stock-based compensation	1,705	190
Continuing Operations
Stock-based compensation expense
Stock-based compensation	5,710	9,800
Continuing Operations \| Cost of sales (excluding depreciation and amortization)
Stock-based compensation expense
Stock-based compensation	70	215
Continuing Operations \| Selling, general and administrative expenses
Stock-based compensation expense
Stock-based compensation	$ 5,640	$ 9,585

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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