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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Stock-Based Compensation Expense | The following table summarizes the Company’s stock-based compensation expense for the years ended December 31, 2016, 2015 and 2014 (in thousands):
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Time-based restricted stock and time-based restricted stock units |  | $ | 2,281 |  |  | $ | 2,704 |  |  | $ | 2,974 |
Performance-based restricted stock and performance-based restricted stock units |  |  | 2,210 |  |  |  | 1,562 |  |  |  | 727 |
Stock appreciation rights |  |  | 184 |  |  |  | 525 |  |  |  | 1,035 |
Employee stock purchase plan |  |  | 113 |  |  |  | 70 |  |  |  | 71 |
Total stock-based compensation |  | $ | 4,788 |  |  | $ | 4,861 |  |  | $ | 4,807 |
Summary of Assumptions Used to Estimate Fair Value of Each SAR | The fair value of each SAR is estimated on the date of grant using a Black-Scholes option-pricing model. There were no SARs issued in the year ended December 31, 2016. For SARs issued in the years ended December 31, 2015 and 2014, respectively, the assumptions shown in the following table were used:
|  | December 31, |
|  | 2015 |  |  | 2014 |
Dividend yield |  |  | 0 | % |  |  | 0 | %
Average risk-free interest rate |  |  | 1.6 | % |  |  | 1.7 | %
Expected term (years) |  |  | 5 |  |  |  | 5 |
Expected volatility |  |  | 42.9 | % |  |  | 52.6 | %
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, 2016 |
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 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (124,352 | ) |  | $ | 11.09 |  |  |  |  |  |  |  |  |
Canceled |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 137,725 |  |  | $ | 19.57 |  |  |  | 5.6 |  |  | $ | 6,174,886 |
Vested at December 31, 2016 |  |  | 127,469 |  |  | $ | 17.83 |  |  |  | 5.4 |  |  | $ | 5,936,639 |
Exercisable at December 31, 2016 |  |  | 127,469 |  |  | $ | 17.83 |  |  |  | 5.4 |  |  | $ | 5,936,639 |
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 |
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 |  |  | — |  |  | $ | — |
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, 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 |
Granted |  |  | 57,874 |  |  | $ | 37.64 |
Vested |  |  | (43,848 | ) |  | $ | 42.34 |
Forfeited |  |  | (133 | ) |  | $ | 43.89 |
Nonvested at December 31, 2016 |  |  | 121,800 |  |  | $ | 31.59 |
Performance-Based Restricted Stock [Member] |
Restricted Stock Activity | Performance-based restricted stock activity under the Plan is as follows:
|  | Performance-based Restricted Stock and Performance-based Restricted Stock Units |  |  | 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 |
Granted |  |  | 44,925 |  |  | $ | 35.83 |
Vested |  |  | (14,949 | ) |  | $ | 35.71 |
Forfeited |  |  | (657 | ) |  | $ | 33.72 |
Nonvested at December 31, 2016 |  |  | 58,416 |  |  | $ | 36.63 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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