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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Option Activity | Stock option activity from January 1, 2019 to September 30, 2019 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
| Underlying |  |  | Exercise Price |
| Shares |  |  | Per Share |
Outstanding at January 1, 2019 |  | 5,501,150 |  |  | $ | 19.63 |
Exercised |  | (700,000 | ) |  | $ | 13.17 |
Expired |  | (15,000 | ) |  | $ | 14.41 |
Outstanding at September 30, 2019 |  | 4,786,150 |  |  | $ | 20.59 |
Exercisable at September 30, 2019 |  | 4,756,150 |  |  | $ | 20.60 |
Restricted Stock Activity | Restricted stock activity from January 1, 2019 to September 30, 2019 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average Grant |
|  |  |  |  | Date Fair Value |
| Shares |  |  | Per Share |
Non-vested restricted stock outstanding at January 1, 2019 |  | 436,224 |  |  | $ | 21.41 |
Vested |  | (319,444 | ) |  | $ | 21.35 |
Forfeited |  | (1,500 | ) |  | $ | 21.71 |
Non-vested restricted stock outstanding at September 30, 2019 |  | 115,280 |  |  | $ | 21.59 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2019 to September 30, 2019 follows:
|  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  | Average Grant |
| Time |  |  | Performance |  |  | Date Fair Value |
| Based |  |  | Based |  |  | Per Share |
Non-vested restricted stock units outstanding at January 1, 2019 |  | 2,602,608 |  |  |  | 435,315 |  |  | $ | 18.95 |
Granted |  | 1,505,048 |  |  |  | — |  |  | $ | 12.40 |
Vested |  | (986,774 | ) |  |  | (38,000 | ) |  | $ | 19.39 |
Forfeited |  | (232,170 | ) |  |  | — |  |  | $ | 17.67 |
Non-vested restricted stock units outstanding at September 30, 2019 |  | 2,888,712 |  |  |  | 397,315 |  |  | $ | 15.90 |
Performance Units | The total target number of shares with respect to the Performance Units for the awards granted in 2015-2019 is set forth below:
| 2019 |  |  | 2018 |  |  | 2017 |  |  | 2016 |  |  | 2015 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Target number of shares |  | 489,800 |  |  |  | 310,700 |  |  |  | 186,198 |  |  |  | 185,000 |  |  |  | 190,600 |
Fair Value of Performance Units | The fair value of the Performance Units is set forth below (in thousands):
| 2019 |  |  | 2018 |  |  | 2017 |  |  | 2016 |  |  | 2015 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Fair value at date of grant | $ | 9,958 |  |  | $ | 8,004 |  |  | $ | 5,780 |  |  | $ | 3,854 |  |  | $ | 4,052 |
Compensation Expense Associated with Performance Units | Compensation expense associated with the Performance Units is shown below (in thousands):
| 2019 |  |  | 2018 |  |  | 2017 |  |  | 2016 |  |  | 2015 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Three months ended September 30, 2019 | $ | 830 |  |  | $ | 667 |  |  | $ | 482 |  |  | NA |  |  | NA |
Three months ended September 30, 2018 | NA |  |  | $ | 667 |  |  | $ | 482 |  |  | $ | 321 |  |  | NA |
Nine months ended September 30, 2019 | $ | 1,660 |  |  | $ | 2,001 |  |  | $ | 1,445 |  |  | $ | 321 |  |  | NA |
Nine months ended September 30, 2018 | NA |  |  | $ | 1,334 |  |  | $ | 1,445 |  |  | $ | 963 |  |  | $ | 338 |

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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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