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Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Stock-based compensation expense
Stock-based compensation expense (income), net of tax	$ 6,099	$ 5,061	$ 10,986	$ 11,908
Stock-based compensation expense per basic and diluted share (in dollars per share)	$ 0.03	$ 0.03	$ 0.06	$ 0.07
Stock-based compensation	7,883	6,317	13,593	16,117
Excess tax benefits from stock-based compensation			2,394	254
Continuing Operations
Stock-based compensation expense
Stock-based compensation	7,883	6,317	13,593	16,117
Continuing Operations \| Cost of sales (excluding depreciation and amortization)
Stock-based compensation expense
Stock-based compensation	72	302	142	517
Continuing Operations \| Selling, general and administrative expenses
Stock-based compensation expense
Stock-based compensation	$ 7,811	$ 6,015	$ 13,451	$ 15,600

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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