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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Option Activity | Stock option activity from January 1, 2018 to June 30, 2018 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
| Underlying |  |  | Exercise Price |
| Shares |  |  | Per Share |
Outstanding at January 1, 2018 |  | 6,037,150 |  |  | $ | 20.35 |
Exercised |  | (40,000 | ) |  | $ | 12.12 |
Expired |  | (496,000 | ) |  | $ | 29.01 |
Outstanding at June 30, 2018 |  | 5,501,150 |  |  | $ | 19.63 |
Exercisable at June 30, 2018 |  | 5,206,454 |  |  | $ | 19.69 |
Restricted Stock Activity | Restricted stock activity from January 1, 2018 to June 30, 2018 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average Grant |
|  |  |  |  | Date Fair Value |
| Shares |  |  | Per Share |
Non-vested restricted stock outstanding at January 1, 2018 |  | 1,530,338 |  |  | $ | 21.41 |
Vested |  | (957,188 | ) |  | $ | 21.52 |
Forfeited |  | (2,884 | ) |  | $ | 21.39 |
Non-vested restricted stock outstanding at June 30, 2018 |  | 570,266 |  |  | $ | 21.23 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2018 to June 30, 2018 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average Grant |
|  |  |  |  | Date Fair Value |
| Shares |  |  | Per Share |
Non-vested restricted stock units outstanding at January 1, 2018 |  | 1,337,273 |  |  | $ | 19.80 |
Granted |  | 2,061,065 |  |  | $ | 18.97 |
Vested |  | (10,234 | ) |  | $ | 21.28 |
Forfeited |  | (26,650 | ) |  | $ | 19.92 |
Non-vested restricted stock units outstanding at June 30, 2018 |  | 3,361,454 |  |  | $ | 19.29 |
Performance Units | The total target number of shares with respect to the Performance Units for the awards granted in 2014-2018 is set forth below:
| 2018 |  |  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2014 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Target number of shares |  | 310,700 |  |  |  | 186,198 |  |  |  | 185,000 |  |  |  | 190,600 |  |  |  | 154,000 |
Fair Value of Performance Units | The fair value of the Performance Units is set forth below (in thousands):
| 2018 |  |  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2014 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Fair value at date of grant | $ | 8,004 |  |  | $ | 5,780 |  |  | $ | 3,854 |  |  | $ | 4,052 |  |  | $ | 5,388 |
Compensation Expense Associated with Performance Units | Compensation expense associated with the Performance Units is shown below (in thousands):
| 2018 |  |  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2014 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Three months ended June 30, 2018 | $ | 667 |  |  | $ | 482 |  |  | $ | 321 |  |  | NA |  |  | NA |
Three months ended June 30, 2017 | NA |  |  | $ | 321 |  |  | $ | 321 |  |  | $ | 338 |  |  | NA |
Six months ended June 30, 2018 | $ | 667 |  |  | $ | 963 |  |  | $ | 642 |  |  | $ | 338 |  |  | NA |
Six months ended June 30, 2017 | NA |  |  | $ | 321 |  |  | $ | 642 |  |  | $ | 675 |  |  | $ | 449 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + 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) -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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