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Stock-based Compensation and Awards (Tables) | 12 Months Ended
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Dec. 31, 2012
Stock-based Compensation and Awards |
Summary of stock-based compensation expense included in results of operations | The following table presents the stock-based compensation expense included in our results of operations (in thousands):
|  | Years Ended December 31, |
|  | 2012 |  | 2011 |  | 2010 |
Stock options |  | $ | 2,552 |  | $ | 3,916 |  | $ | 5,273 |
Restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units |  | 16,583 |  | 14,970 |  | 17,796 |
Employee stock purchase plan |  | 114 |  | 278 |  | 282 |
Total stock-based compensation expense |  | $ | 19,249 |  | $ | 19,164 |  | $ | 23,351 |
Schedule of weighted average assumptions |
|  | Years Ended December 31, |
|  | 2012 |  | 2011 |  | 2010 |
Expected life in years |  | 4.5 |  | 4.5 |  | 4.5 |
Risk-free interest rate |  | 0.78 | % | 1.23 | % | 2.13 | %
Volatility |  | 47.96 | % | 45.17 | % | 42.94 | %
Dividend yield |  | 0.0 | % | 0.0 | % | 0.0 | %
Summary of stock option activity | The following table presents stock option activity for the year ended December 31, 2012 (in thousands, except per share data and remaining life in years):
|  | Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Life |  | Aggregate Intrinsic Value |
Options outstanding, December 31, 2011 |  | 3,271 |  | $ | 27.39 |  |  |  |  |
Granted |  | 153 |  | 14.36 |  |  |  |  |
Exercised |  | (34 | ) | 16.41 |  |  |  |  |
Cancelled |  | (806 | ) | 26.55 |  |  |  |  |
Options outstanding, December 31, 2012 |  | 2,584 |  | 27.02 |  | 4.6 |  | $ | 10,866 |
Options exercisable, December 31, 2012 |  | 1,828 |  | 31.99 |  | 3.6 |  | 5,425 |
Schedule of restricted stock, restricted stock unit and cash settled restricted stock unit and cash settled performance award activity | The following table presents restricted stock, restricted stock unit, cash settled restricted stock unit and cash settled performance award activity for the year ended December 31, 2012 (in thousands, except per share data):
|  | Shares |  | Weighted Average Grant-Date Fair Value Per Share |
Non-vested awards, December 31, 2011 |  | 1,670 |  | $ | 19.49 |
Granted |  | 1,221 |  | 14.33 |
Vested |  | (772 | ) | 19.09 |
Change in expected vesting of cash settled performance awards |  | 44 |  | 14.36 |
Cancelled |  | (171 | ) | 22.39 |
Non-vested awards, December 31, 2012(1) |  | 1,992 |  | 16.12 |
(1) Non-vested awards as of December 31, 2012 are comprised of 545 thousand cash settled restricted stock units and cash settled performance awards and 1,447 thousand restricted stock shares and stock settled restricted stock units.
Schedule of phantom unit activity |
|  | Phantom Units |  | Weighted Average Grant-Date Fair Value per Unit |
Phantom units outstanding, December 31, 2011 |  | 75,267 |  | $ | 21.45 |
Granted |  | 29,717 |  | 22.62 |
Vested |  | (40,329 | ) | 18.73 |
Cancelled |  | (771 | ) | 28.50 |
Phantom units outstanding, December 31, 2012 |  | 63,884 |  | 23.62 |

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