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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Option Activities of Long-Term Incentive and Option Plans | The following information relates to our long-term incentive plans:
|  | December 31, 2019 |
|  | 2016 Plan |  |  | 2008 Plan |
Maximum number of securities for issuance |  |  | 2,750,000 |  |  |  |  |
Number of awards available to be granted (1) |  |  | 1,285,922 |  |  |  |  |
Number of unvested restricted stock/performance-based restricted stock/restricted stock units outstanding |  |  | 925,851 |  |  |  | — |
Number of options outstanding |  |  | — |  |  |  | 124,000 |
Number of options exercisable |  |  | — |  |  |  | 111,750 |
.
(1) | Includes 2008 Plan shares canceled, forfeited, expired unexercised, which became available for reissuance under the 2016 Plan after the effective date of the 2016 Plan.
|  | 2019 |
|  | Shares |  |  | Weighted-Average Exercise Price |
Outstanding at beginning of year |  |  | 124,000 |  |  | $ | 33.86 |
Granted |  |  | — |  |  | $ | — |
Exercised |  |  | — |  |  | $ | — |
Forfeited or expired |  |  | — |  |  | $ | — |
Outstanding at end of year |  |  | 124,000 |  |  | $ | 33.86 |
Exercisable at end of year |  |  | 111,750 |  |  | $ | 33.91 |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Stock-based compensation expense - Cost of sales |  | $ | 122,000 |  |  | $ | 141,000 |  |  | $ | 317,000 |
Stock-based compensation expense - SG&A |  | $ | 50,000 |  |  | $ | 71,000 |  |  | $ | 108,000 |
Income tax benefit |  | $ | (42,000 | ) |  | $ | (54,000 | ) |  | $ | (164,000 | )
Total intrinsic value of options exercised during the year |  | $ | — |  |  | $ | — |  |  | $ | — |
Total fair value of options vested during the year |  | $ | 169,000 |  |  | $ | 169,000 |  |  | $ | 451,000 |
Total intrinsic value of options outstanding at end of year |  | $ | — |  |  | $ | — |  |  | $ | 16,000 |
Total intrinsic value of options exercisable at end of year |  | $ | — |  |  | $ | — |  |  | $ | 16,000 |
Total weighted-average remaining vesting period in years |  | 0.49 |  |  |  | 1.05 |  |  |  | 1.53 |
Total weighted-average remaining contractual life period in years (options outstanding) |  | 3.61 |  |  |  | 4.61 |  |  |  | 5.10 |
Total weighted-average remaining contractual life period in years (options exercisable) |  | 3.47 |  |  |  | 4.31 |  |  |  | 4.44 |
Summary of Restricted Stock Activity | A summary of restricted stock activity during 2019 is presented below:
|  | Restricted Stock |  |  | Performance-Based Restricted Stock |  |  | Restricted Stock Units |
|  | Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Shares |  |  | Weighted- Average Grant Date Fair Value |
Unvested restricted stock outstanding at beginning of year |  |  | 739,465 |  |  | $ | 7.79 |  |  |  | — |  |  | $ | — |  |  |  | 68,334 |  |  | $ | 8.23 |
Granted |  |  | 285,956 |  |  | $ | 4.28 |  |  |  | 221,439 |  |  | $ | 7.26 |  |  |  | 31,833 |  |  | $ | 5.89 |
Vested |  |  | (407,349 | ) |  | $ | 8.27 |  |  |  | — |  |  | $ | — |  |  |  | (13,827 | ) |  | $ | 13.56 |
Cancelled or forfeited |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Unvested restricted stock outstanding at end of year |  |  | 618,072 |  |  | $ | 5.42 |  |  |  | 221,439 |  |  | $ | 7.26 |  |  |  | 86,340 |  |  | $ | 6.51 |
|  | Restricted Stock |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Shares of restricted stock granted |  |  | 285,956 |  |  |  | 369,350 |  |  |  | 469,465 |
Total fair value of restricted stock granted |  | $ | 1,223,000 |  |  | $ | 2,019,000 |  |  | $ | 4,277,000 |
Weighted-average fair value per restricted stock granted during year |  | $ | 4.28 |  |  | $ | 5.47 |  |  | $ | 9.11 |
Stock-based compensation expense - Cost of sales |  | $ | 255,000 |  |  | $ | 385,000 |  |  | $ | 312,000 |
Stock-based compensation expense - SG&A (1) |  | $ | 1,263,000 |  |  | $ | 7,574,000 |  |  | $ | 3,987,000 |
Income tax benefit |  | $ | (374,000 | ) |  | $ | (398,000 | ) |  | $ | (1,659,000 | )
Total weighted-average remaining vesting period in years |  | 2.18 |  |  |  | 1.78 |  |  |  | 1.95 |
Total fair value of restricted stock vested during the year |  | $ | 3,371,000 |  |  | $ | 7,355,000 |  |  | $ | 3,124,000 |
|  | Performance-Based Restricted Stock |
|  | 2019 (2) |
Shares of PBRS granted |  |  | 221,439 |
Total fair value of PBRS granted |  | $ | 1,608,000 |
Weighted-average fair value per PBRS granted during year |  | $ | 7.26 |
Stock-based compensation expense - Cost of sales |  | $ | 53,000 |
Stock-based compensation expense - SG&A |  | $ | 290,000 |
Income tax benefit |  | $ | (84,000 | )
Total weighted-average remaining vesting period in years |  |  | 1.85 |
Total fair value of PBRS vested during the year |  | $ | - |
|  | Restricted Stock Units |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Shares of RSU granted |  |  | 31,833 |  |  |  | 35,511 |  |  |  | 37,992 |
Total fair value of RSU granted |  | $ | 187,000 |  |  | $ | 187,000 |  |  | $ | 375,000 |
Weighted-average fair value per RSU granted during year |  | $ | 5.89 |  |  | $ | 5.28 |  |  | $ | 9.87 |
Stock-based compensation expense - SG&A |  | $ | 187,000 |  |  | $ | 187,000 |  |  | $ | 375,000 |
Income tax benefit |  | $ | (46,000 | ) |  | $ | (34,000 | ) |  | $ | (115,000 | )
Total weighted-average remaining vesting period in years |  |  | 1.57 |  |  |  | 1.75 |  |  |  | 3.05 |
Total fair value of RSU vested during the year |  | $ | 187,000 |  |  | $ | 125,000 |  |  | $ | 250,000 |
(1) | As it relates to 2018, see Note 14-Related Party Transactions.
(2) | The PBRS restricted stock grants are tied to our free cash flow, fixed costs per ton of ammonia measured annually over a three-year period and modified based on our ranking relative to total stockholder return (share price appreciation plus dividends reinvested) (“TSR”) versus the companies in our 2019 peer group (“Peer Group”) over a three-year measurement period. The actual number of shares that will vest at the end of the third year will be based on our performance against the metrics set in the award. The threshold performance for free cash flow is 70% and for fixed costs per ton of ammonia is 50% of the targeted improvement with a maximum for each of 120% of target. The TSR modifier will adjust the overall actual performance up or down by as much as 25% based on the our TSR versus the Peer Group average TSR. We estimate the fair value of each PBRS on the date of grant using a Monte Carlo simulation.

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