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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, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of Significant Accounting Policies
Stock-based compensation expense (income), net of tax	$ 5,061	$ (430)	$ 11,908	$ 2,734
Stock-based compensation expense per basic and diluted share (in dollars per share)	$ 0.03	$ 0.00	$ 0.07	$ 0.01
Stock-based compensation expense
Stock-based compensation	6,317	3,266	16,117	8,299
Excess tax benefits from stock-based compensation			254	57
Continuing Operations
Stock-based compensation expense
Stock-based compensation	6,317	3,600	16,117	8,039
Continuing Operations \| Cost of sales (excluding depreciation and amortization)
Stock-based compensation expense
Stock-based compensation	302	45	517	320
Continuing Operations \| Selling, general and administrative expenses
Stock-based compensation expense
Stock-based compensation	6,015	3,555	15,600	7,719
Discontinued Operations
Stock-based compensation expense
Stock-based compensation		$ (334)		$ 260

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

Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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