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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, 2012	Mar. 31, 2011
Summary of Significant Accounting Policies
Stock-based compensation expense, net of tax	$ 6,847	$ 3,164
Stock-based compensation expense per basic and diluted share (in dollars per share)	$ 0.04	$ 0.02
Stock based compensation expense
Stock based compensation	9,800	5,033
Excess tax benefits from stock-based compensation	190	1,017
Continuing Operations
Stock based compensation expense
Stock based compensation	9,800	4,439
Continuing Operations \| Cost of sales (excluding depreciation and amortization)
Stock based compensation expense
Stock based compensation	215	275
Continuing Operations \| Selling, general and administrative expenses
Stock based compensation expense
Stock based compensation	9,585	4,164
Discontinued Operations
Stock based compensation expense
Stock based compensation		$ 594

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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