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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of the Company's Stock Option Activity | A summary of the Company’s stock option activity is as follows:
|  | Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value |
Options outstanding as of December 31, 2018 |  |  | 956,164 |  |  |  | 21.58 |  |  |  |  |
Granted |  |  | 210,243 |  |  |  | 18.40 |  |  |  |  |
Exercised |  |  | (58,404 | ) |  |  | 6.57 |  |  |  |  |
Forfeited |  |  | (17,164 | ) |  |  | 23.81 |  |  |  |  |
Cancelled |  |  | (24,868 | ) |  |  | 21.18 |  |  |  |  |
Options outstanding as of December 31, 2019 |  |  | 1,065,971 |  |  | $ | 21.75 |  |  | $ | 0.4 |
Options exercisable as of December 31, 2019 |  |  | 623,487 |  |  | $ | 20.96 |  |  | $ | 0.4 |
Schedule of the Assumptions Used to Estimate the Fair Value of Each Option Grant | The fair value of each option grant was estimated at the date of grant using the following assumptions:
|  | 2019 |  |  | 2018 |  |  | 2017 |
Expected life (years) |  |  | 6.5 |  |  |  | 6.5 |  |  |  | 6.5 |
Risk-free interest rate |  |  | 2.6 | % |  |  | 2.8 | % |  |  | 2.2 | %
Expected volatility |  |  | 39.8 | % |  |  | 43.7 | % |  |  | 45.0 | %
Expected dividend yield |  |  | — | % |  |  | — | % |  |  | — | %
Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Share Activity | A summary of activity for restricted stock units is as follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested as of December 31, 2018 |  |  | 219,917 |  |  |  | 25.37 |
Granted |  |  | 229,044 |  |  |  | 18.39 |
Vested |  |  | (154,295 | ) |  |  | 20.26 |
Forfeited |  |  | (4,103 | ) |  |  | 27.34 |
Unvested as of December 31, 2019 |  |  | 290,563 |  |  | $ | 22.55 |
Performance Shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of the Assumptions Used to Estimate the Fair Value of Each Option Grant | The fair value of each total shareholder return performance stock unit was estimated at the date of grant using the following assumptions:
|  | 2019 |  |  | 2018 |  |  | 2017 |
Correlation |  |  | 32.5 | % |  |  | 29.5 | % |  |  | 31.6 | %
Risk-free interest rate |  |  | 2.5 | % |  |  | 2.4 | % |  |  | 1.5 | %
Expected volatility |  |  | 47.0 | % |  |  | 33.8 | % |  |  | 35.0 | %
Expected dividend yield |  |  | — | % |  |  | — | % |  |  | — | %
Schedule of Nonvested Share Activity | A summary of activity for performance stock units is as follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested as of December 31, 2018 |  |  | 337,124 |  |  |  | 28.02 |
Granted |  |  | 228,037 |  |  |  | 22.01 |
Vested |  |  | (74,315 | ) |  |  | 25.73 |
Forfeited |  |  | (78,441 | ) |  |  | 20.24 |
Unvested as of December 31, 2019 |  |  | 412,405 |  |  | $ | 26.58 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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