Stock-based Compensation Plans and Awards (Schedule of Fair Value Calculation Assumptions) (Details)
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3 Months Ended | |
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Mar. 31, 2014
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Mar. 31, 2013
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Dividend yield | ||
Volatility | 66.00% | 65.00% |
Minimum [Member]
|
||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Risk-free interest rate | 1.74% | 0.83% |
Expected term | 5 years | 5 years |
Maximum [Member]
|
||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Risk-free interest rate | 2.68% | 1.13% |
Expected term | 10 years | 10 years |