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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Restricted Stock Unit Activity | The table below summarizes restricted stock unit activity for the year ended December 31, 2012:
|  | Restricted Stock Units |  |  | Weighted Average Grant Date Fair Value |
Restricted stock units outstanding at December 31, 2011 |  |  | 806,263 |  |  | $ | 28.31 |
Granted |  |  | 287,604 |  |  |  | 42.50 |
Released |  |  | (132,846 | ) |  |  | 26.40 |
Cancelled |  |  | (28,420 | ) |  |  | 30.15 |
Restricted stock units outstanding at December 31, 2012 |  |  | 932,601 |  |  |  | 32.90 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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