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Stockholders' Equity and Share Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2012
Stockholders' Equity and Share Based Compensation Plans [Abstract] |
Assumptions used to determine the fair value of options |
|  | 2012 |  |  | 2011 |
Dividend yield |  |  | 0.0 | % |  |  | 0.2 | %
Expected life |  |  | 5 years |  |  |  | 5 years |
Volatility |  |  | 60.1 | % |  |  | 78.3 | %
Risk free interest rate |  |  | 0.43 | % |  |  | 1.22 | %
Summary of transactions of the Company's stock option plans |
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  |
Outstanding at March 31, 2012 |  |  | 1,297,438 |  |  | $ | 5.68 |  |  |
Exercised |  |  | (176,061 | ) |  | $ | 2.90 |  |  |
Forfeited |  |  | (4,735 | ) |  | $ | 9.78 |  |  |
Outstanding at June 30, 2012 |  |  | 1,116,642 |  |  | $ | 6.10 |  |  |
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Fair Value |
Outstanding at December 31, 2011 |  |  | 1,229,220 |  |  | $ | 5.44 |  |  |  |  |
Granted: |  |  |  |  |  |  |  |  |  |  |  |
At discount |  |  | 71,132 |  |  | $ | 0.00 |  |  | $ | 21.39 |
At market value |  |  | 31,012 |  |  | $ | 29.56 |  |  | $ | 16.70 |
Exercised |  |  | (208,409 | ) |  | $ | 3.51 |  |  |  |  |
Forfeited |  |  | (6,313 | ) |  | $ | 10.08 |  |  |  |  |
Outstanding at June 30, 2012 |  |  | 1,116,642 |  |  | $ | 6.10 |  |  |  |  |
Summary of information about options outstanding |
Range of Exercise Price |  | Number Outstanding |  |  | Weighted Average Remaining Life in Years |  |  | Weighted Average Exercise Price |  |  | Number Exercisable and Fully Vested |  |  | Weighted Average Remaining Life in Years |  |  | Weighted Average Exercise Price |
$0-$5 |  |  | 641,549 |  |  |  | 7.43 |  |  | $ | 0.57 |  |  |  | 102,855 |  |  |  | 6.25 |  |  | $ | 1.21 |
$5-$10 |  |  | 22,654 |  |  |  | 3.00 |  |  | $ | 9.66 |  |  |  | 22,654 |  |  |  | 3.00 |  |  | $ | 9.66 |
$10-$15 |  |  | 386,946 |  |  |  | 2.51 |  |  | $ | 11.48 |  |  |  | 0 |  |  |  | 0.00 |  |  | $ | 0.00 |
$20-$25 |  |  | 12,385 |  |  |  | 5.68 |  |  | $ | 20.53 |  |  |  | 12,385 |  |  |  | 5.68 |  |  | $ | 20.53 |
$25-$30 |  |  | 51,728 |  |  |  | 8.29 |  |  | $ | 28.57 |  |  |  | 12,416 |  |  |  | 4.65 |  |  | $ | 27.09 |
$30-$35 |  |  | 1,380 |  |  |  | 8.87 |  |  | $ | 32.60 |  |  |  | 0 |  |  |  | 0.00 |  |  | $ | 0.00 |
|  |  | 1,116,642 |  |  |  |  |  |  |  |  |  |  |  | 150,310 |  |  |  |  |  |  |  |  |
Schedule of fair value of liability cash settled stock appreciation rights |
(in millions) |  | 2012 |  |  | 2011 |
Balance at January 1 |  | $ | 2.2 |  |  | $ | 0.8 |
Compensation charge |  |  | 3.0 |  |  |  | 1.6 |
Balance at June 30 |  | $ | 5.2 |  |  | $ | 2.4 |
Assumptions used in the Monte Carlo model |
|  | 2012 |  |  | 2011 |
Dividend yield |  |  | 0.0 | % |  |  | 0.2 | %
Volatility |  |  | 29.5 | % |  |  | 45.7 | %
Risk free interest rate |  |  | 0.40 | % |  |  | 0.81 | %

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