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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Compensation Expense Recognized Related to all Stock-Based Awards | The following table presents compensation expense recognized related to all stock-based awards (in thousands):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Total stock-based compensation | $ | 14,814 |  |  | $ | 15,906 |  |  | $ | 12,612 |
Summary of Stock Option Awards | The following table presents a summary of stock option awards for the year ended December 31, 2018:
| Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value (in thousands)
Options outstanding at December 31, 2017 | 1,154,658 |  |  | $ | 14.16 |  |  | 4.9 |  |  | $ | 4,350 |
Granted | — |  |  | — |  |  | — |  |  |  |
Exercised | (171,747 | ) |  | $ | 12.05 |  |  |  |  |
Forfeited | (29,006 | ) |  | $ | 12.73 |  |  |  |  |
Options outstanding at December 31, 2018 | 953,905 |  |  | $ | 14.58 |  |  | 4.2 |  |  | $ | 296 |
Options exercisable at December 31, 2018 | 953,905 |  |  | $ | 14.58 |  |  | 4.2 |  |  | $ | 296 |
Summary of Restricted Stock Units | The following table presents a summary of restricted stock units (“RSUs”) for the year ended December 31, 2018:
| Restricted Stock Units |  | Weighted Average Grant Date Fair Value Per Share |  | Aggregate Intrinsic Value (in thousands)
Nonvested RSUs at December 31, 2017 | 4,307,592 |  |  | $ | 9.80 |  |  | $ | 77,192 |
Granted | 1,131,231 |  |  | $ | 15.77 |  |  |  |
Vested | (1,102,727 | ) |  | $ | 12.47 |  |  |
Forfeited | (994,248 | ) |  | $ | 9.40 |  |  |
Nonvested RSUs at December 31, 2018 | 3,341,848 |  |  | $ | 11.05 |  |  | $ | 36,526 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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