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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Summary of Stock-Based Compensation Expense | The following table summarizes the Company’s stock-based compensation expense for the years ended December 31, 2014, 2013 and 2012 (in thousands):
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Time-based restricted stock |  | $ | 2,974 |  |  | $ | 2,461 |  |  | $ | 2,035 |
Performance-based restricted stock |  |  | 727 |  |  |  | — |  |  |  | — |
Stock appreciation rights |  |  | 1,035 |  |  |  | 1,251 |  |  |  | 1,369 |
Employee stock purchase plan |  |  | 71 |  |  |  | 99 |  |  |  | 65 |
Total stock-based compensation |  | $ | 4,807 |  |  | $ | 3,811 |  |  | $ | 3,469 |
Summary of Assumptions Used to Estimate Fair Value of Each SAR | For SARs issued in the years ended December 31, 2014, 2013 and 2012, respectively, the assumptions shown in the following table were used:
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Average risk-free interest rate |  |  | 1.7 | % |  |  | 0.7 | % |  |  | 0.8 | %
Expected term (years) |  |  | 5 |  |  |  | 5 |  |  |  | 5 |
Expected volatility |  |  | 52.6 | % |  |  | 63.7 | % |  |  | 65.9 | %
SAR Activity | SAR activity under the Plan and all predecessor stock incentive plans is as follows:
|  | SARs |  |  | Weighted- Average Grant Price Per Share |  |  | Weighted- Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value as of December 31, 2014 |
Outstanding at December 31, 2011 |  |  | 2,325,410 |  |  | $ | 6.59 |  |  |  |  |  |  |  |  |
Granted |  |  | 201,828 |  |  | $ | 12.88 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,135,906 | ) |  | $ | 6.54 |  |  |  |  |  |  |  |  |
Canceled |  |  | (16,952 | ) |  | $ | 12.08 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 1,374,380 |  |  | $ | 9.28 |  |  |  |  |  |  |  |  |
Granted |  |  | 121,176 |  |  | $ | 21.95 |  |  |  |  |  |  |  |  |
Exercised |  |  | (749,334 | ) |  | $ | 7.70 |  |  |  |  |  |  |  |  |
Canceled |  |  | (7,028 | ) |  | $ | 13.10 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 739,194 |  |  | $ | 12.93 |  |  |  |  |  |  |  |  |
Granted |  |  | 3,866 |  |  | $ | 37.88 |  |  |  |  |  |  |  |  |
Exercised |  |  | (218,826 | ) |  | $ | 10.96 |  |  |  |  |  |  |  |  |
Canceled |  |  | (8,404 | ) |  | $ | 4.74 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 515,830 |  |  | $ | 13.98 |  |  |  | 6.5 |  |  | $ | 14,754,320 |
Vested at December 31, 2014 |  |  | 383,488 |  |  | $ | 12.55 |  |  |  | 6.1 |  |  | $ | 11,514,749 |
Exercisable at December 31, 2014 |  |  | 383,488 |  |  | $ | 12.55 |  |  |  | 6.1 |  |  | $ | 11,514,749 |
Stock Option Activity | Stock option activity under the Plan and all predecessor stock incentive plans is as follows:
|  | Options |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value as of December 31, 2014 |
Outstanding at December 31, 2011 |  |  | 290,138 |  |  | $ | 19.04 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (46,378 | ) |  | $ | 15.68 |  |  |  |  |  |  |  |  |
Canceled |  |  | (2,484 | ) |  | $ | 10.00 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 241,276 |  |  | $ | 20.19 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (186,968 | ) |  | $ | 24.92 |  |  |  |  |  |  |  |  |
Canceled |  |  | (12,020 | ) |  | $ | 18.16 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 42,288 |  |  | $ | 20.05 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (27,942 | ) |  | $ | 35.73 |  |  |  |  |  |  |  |  |
Canceled |  |  | (1,188 | ) |  | $ | 17.92 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 13,158 |  |  | $ | 23.36 |  |  |  | 0.2 |  |  | $ | 252,963 |
Vested at December 31, 2014 |  |  | 13,158 |  |  | $ | 23.36 |  |  |  | 0.2 |  |  | $ | 252,963 |
Exercisable at December 31, 2014 |  |  | 13,158 |  |  | $ | 23.36 |  |  |  | 0.2 |  |  | $ | 252,963 |
Time-Based Restricted Stock [Member] |
Restricted Stock Activity | Time-based restricted stock activity under the Plan and all predecessor stock incentive plans is as follows:
|  | Time-based Restricted Stock |  |  | Weighted-Average Grant Price Per Share |
Nonvested at December 31, 2011 |  |  | 320,350 |  |  | $ | 11.50 |
Granted |  |  | 313,854 |  |  | $ | 13.59 |
Vested |  |  | (189,410 | ) |  | $ | 13.44 |
Forfeited |  |  | (15,424 | ) |  | $ | 12.74 |
Nonvested at December 31, 2012 |  |  | 429,370 |  |  | $ | 12.08 |
Granted |  |  | 94,030 |  |  | $ | 22.21 |
Vested |  |  | (139,594 | ) |  | $ | 22.28 |
Forfeited |  |  | (832 | ) |  | $ | 16.16 |
Nonvested at December 31, 2013 |  |  | 382,974 |  |  | $ | 13.78 |
Granted |  |  | 66,511 |  |  | $ | 32.70 |
Vested |  |  | (116,641 | ) |  | $ | 33.73 |
Forfeited |  |  | (3,282 | ) |  | $ | 16.61 |
Nonvested at December 31, 2014 |  |  | 329,562 |  |  | $ | 18.89 |
Performance-Based Restricted Stock [Member] |
Restricted Stock Activity | Performance-based restricted stock activity under the Plan is as follows:
|  | Performance-based Restricted Stock |  |  | Weighted-Average Grant Price Per Share |
Nonvested at December 31, 2013 |  |  | — |  |  | $ | — |
Granted |  |  | 42,676 |  |  | $ | 33.72 |
Vested |  |  | — |  |  | $ | — |
Forfeited |  |  | — |  |  | $ | — |
Nonvested at December 31, 2014 |  |  | 42,676 |  |  | $ | 33.72 |

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