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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Summary of Stock-Based Compensation Expense | The following table summarizes the Company’s stock-based compensation expense for the years ended December 31, 2015, 2014 and 2013 (in thousands):
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Time-based restricted stock |  | $ | 2,704 |  |  | $ | 2,974 |  |  | $ | 2,461 |
Performance-based restricted stock |  |  | 1,562 |  |  |  | 727 |  |  |  | — |
Stock appreciation rights |  |  | 525 |  |  |  | 1,035 |  |  |  | 1,251 |
Employee stock purchase plan |  |  | 70 |  |  |  | 71 |  |  |  | 99 |
Total stock-based compensation |  | $ | 4,861 |  |  | $ | 4,807 |  |  | $ | 3,811 |
Summary of Assumptions Used to Estimate Fair Value of Each SAR | For SARs issued in the years ended December 31, 2015, 2014 and 2013, respectively, the assumptions shown in the following table were used:
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Average risk-free interest rate |  |  | 1.6 | % |  |  | 1.7 | % |  |  | 0.7 | %
Expected term (years) |  |  | 5 |  |  |  | 5 |  |  |  | 5 |
Expected volatility |  |  | 42.9 | % |  |  | 52.6 | % |  |  | 63.7 | %
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, 2015 |
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 |  |  |  |  |  |  |  |  |
Granted |  |  | 15,585 |  |  | $ | 41.19 |  |  |  |  |  |  |  |  |
Exercised |  |  | (263,626 | ) |  | $ | 13.86 |  |  |  |  |  |  |  |  |
Canceled |  |  | (5,712 | ) |  | $ | 21.94 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 262,077 |  |  | $ | 13.13 |  |  |  | 5.7 |  |  | $ | 5,948,519 |
Vested at December 31, 2015 |  |  | 229,415 |  |  | $ | 13.34 |  |  |  | 5.3 |  |  | $ | 5,670,343 |
Exercisable at December 31, 2015 |  |  | 229,415 |  |  | $ | 13.34 |  |  |  | 5.3 |  |  | $ | 5,670,343 |
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, 2015 |
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 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (13,158 | ) |  | $ | 50.37 |  |  |  |  |  |  |  |  |
Canceled |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Vested at December 31, 2015 |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Exercisable at December 31, 2015 |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
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, 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 |
Granted |  |  | 57,598 |  |  | $ | 43.81 |
Vested |  |  | (230,704 | ) |  | $ | 42.37 |
Forfeited |  |  | (48,549 | ) |  | $ | 20.20 |
Nonvested at December 31, 2015 |  |  | 107,907 |  |  | $ | 29.43 |
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, 2014 |  |  | 42,676 |  |  | $ | 33.72 |
Granted |  |  | 34,638 |  |  | $ | 43.89 |
Vested |  |  | (35,679 | ) |  | $ | 41.91 |
Forfeited |  |  | (12,538 | ) |  | $ | 38.12 |
Nonvested at December 31, 2015 |  |  | 29,097 |  |  | $ | 39.38 |

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