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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2014
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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- Definition Schedule of Share-Based Payment Award, Option Exchange Program, Valuation Assumptions for Exchanged Options [Table Text Block] + References No definition available. + Details
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- Details
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