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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Stockholders' Equity Note [Abstract]

Schedule of valuation assumptions, Exchange Option Program

The fair value of each exchanged option was determined on the date the Exchange Program commenced using the Black-Scholes option pricing model, and the following assumptions:

		Range of Assumptions
Dividend yield		—
Expected term (years)		1.3 - 7.3
Expected volatility		37% - 78%
Risk-free interest rate		0.23% - 1.50%

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Schedule of Share-Based Payment Award, Option Exchange Program, Valuation Assumptions for Exchanged Options [Table Text Block]

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