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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Option Activity | Stock option activity from January 1, 2020 to March 31, 2020 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
| Underlying |  |  | Exercise Price |
| Shares |  |  | Per Share |
Outstanding at January 1, 2020 |  | 4,766,150 |  |  | $ | 20.62 |
Exercised |  | — |  |  | $ | — |
Expired |  | — |  |  | $ | — |
Outstanding at March 31, 2020 |  | 4,766,150 |  |  | $ | 20.62 |
Exercisable at March 31, 2020 |  | 4,736,150 |  |  | $ | 20.63 |
Restricted Stock Activity | Restricted stock activity from January 1, 2020 to March 31, 2020 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average Grant |
|  |  |  |  | Date Fair Value |
| Shares |  |  | Per Share |
Non-vested restricted stock outstanding at January 1, 2020 |  | 72,051 |  |  | $ | 21.59 |
Vested |  | (43,230 | ) |  | $ | 21.59 |
Forfeited |  | — |  |  | $ | — |
Non-vested restricted stock outstanding at March 31, 2020 |  | 28,821 |  |  | $ | 21.59 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2020 to March 31, 2020 follows:
|  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  | Average Grant |
| Time |  |  | Performance |  |  | Date Fair Value |
| Based |  |  | Based |  |  | Per Share |
Non-vested restricted stock units outstanding at January 1, 2020 |  | 2,631,726 |  |  |  | 397,315 |  |  | $ | 15.81 |
Granted |  | 99,996 |  |  |  | — |  |  | $ | 10.50 |
Vested |  | (151,056 | ) |  |  | — |  |  | $ | 13.40 |
Forfeited |  | (93,174 | ) |  |  | — |  |  | $ | 14.41 |
Non-vested restricted stock units outstanding at March 31, 2020 |  | 2,487,492 |  |  |  | 397,315 |  |  | $ | 15.80 |
Performance Units | The total target number of shares with respect to the Performance Units for the awards granted in 2016-2019 is set forth below:
| 2019 |  |  | 2018 |  |  | 2017 |  |  | 2016 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Target number of shares |  | 489,800 |  |  |  | 310,700 |  |  |  | 186,198 |  |  |  | 185,000 |
Fair Value of Performance Units | The fair value of the Performance Units is set forth below (in thousands):
| 2019 |  |  | 2018 |  |  | 2017 |  |  | 2016 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Fair value at date of grant | $ | 9,958 |  |  | $ | 8,004 |  |  | $ | 5,780 |  |  | $ | 3,854 |
Compensation Expense Associated with Performance Units | Compensation expense associated with the Performance Units is shown below (in thousands):
| 2019 |  |  | 2018 |  |  | 2017 |  |  | 2016 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Three months ended March 31, 2020 | $ | 830 |  |  | $ | 667 |  |  | $ | 482 |  |  | NA |
Three months ended March 31, 2019 | NA |  |  | $ | 667 |  |  | $ | 482 |  |  | $ | 321 |

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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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