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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Option Activity | Stock option activity from January 1, 2021 to June 30, 2021 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
| Underlying |  |  | Exercise Price |
| Shares |  |  | Per Share |
Outstanding at January 1, 2021 |  | 4,026,150 |  |  | $ | 21.63 |
Exercised |  | — |  |  | $ | — |
Expired |  | (276,000 | ) |  | $ | 31.20 |
Outstanding at June 30, 2021 |  | 3,750,150 |  |  | $ | 20.92 |
Exercisable at June 30, 2021 |  | 3,735,150 |  |  | $ | 20.93 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2021 to June 30, 2021 follows:
|  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  | Average Grant |
| Time |  |  | Performance |  |  | Date Fair Value |
| Based |  |  | Based |  |  | Per Share |
Non-vested restricted stock units outstanding at January 1, 2021 |  | 2,741,548 |  |  |  | 359,315 |  |  | $ | 9.52 |
Granted |  | 1,797,875 |  |  |  | — |  |  | $ | 8.32 |
Vested |  | (1,185,049 | ) |  |  | — |  |  | $ | 10.14 |
Forfeited |  | (85,572 | ) |  |  | — |  |  | $ | 11.29 |
Non-vested restricted stock units outstanding at June 30, 2021 |  | 3,268,802 |  |  |  | 359,315 |  |  | $ | 8.68 |
Performance Units | The total target number of shares with respect to the Performance Units for the awards granted in 2017-2021 is set forth below:
| 2021 |  |  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2017 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Target number of shares |  | 843,000 |  |  |  | 500,500 |  |  |  | 489,800 |  |  |  | 310,700 |  |  |  | 186,198 |
Fair Value of Performance Units | The fair value of the Performance Units is set forth below (in thousands):
| 2021 |  |  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2017 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Aggregate fair value at date of grant | $ | 7,225 |  |  | $ | 826 |  |  | $ | 9,958 |  |  | $ | 8,004 |  |  | $ | 5,780 |
Compensation Expense Associated with Performance Units | Compensation expense associated with the Performance Units is shown below (in thousands):
| 2021 |  |  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2017 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Three months ended June 30, 2021 | $ | 602 |  |  | $ | 69 |  |  | $ | 830 |  |  | NA |  |  | NA |
Three months ended June 30, 2020 | NA |  |  | $ | 69 |  |  | $ | 830 |  |  | $ | 667 |  |  | $ | 161 |
Six months ended June 30, 2021 | $ | 602 |  |  | $ | 138 |  |  | $ | 1,660 |  |  | $ | 667 |  |  | NA |
Six months ended June 30, 2020 | NA |  |  | $ | 69 |  |  | $ | 1,660 |  |  | $ | 1,334 |  |  | $ | 642 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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