Stock-based Compensation (Notes)	9 Months Ended
Stock-based Compensation (Notes)	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	11. STOCK-BASED COMPENSATION In the third quarter of 2013, we recorded $5.1 million of expense for the accelerated vesting of restricted stock units and stock options as a result of the passing of our Co-Founder and Executive Chairman of the Board of Directors. On March 6, 2013, we granted approximately 0.8 million restricted stock units with a grant-date fair value of $12.71. The unearned compensation will be expensed over the vesting period of three years.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

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