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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of restricted stock units issued and compensation expense | The following table summarizes RSUs issued and the compensation expense recorded for the years ended December 31, 2019, 2018, and 2017:
|  | RSUs (a) |  | Weighted Average Fair Value |  | Expense
(Dollars in thousands, except per unit) |  |  |  | 2019 |  | 2018 |  | 2017
Directors: |  |  |  |  |  |  |  |  |  |
2016 |  | 109,998 |  |  | $ | 7.00 |  |  | $ | — |  |  | $ | — |  |  | $ | 257 |
2017 |  | 56,203 |  |  | 13.70 |  |  | — |  |  | 179 |  |  | 641 |
2018 |  | 43,821 |  |  | 20.54 |  |  | 280 |  |  | 511 |  |  | — |
2019 |  | 14,211 |  |  | 25.33 |  |  | 240 |  |  | — |  |  | — |
Employees: |  |  |  |  |  |  |  |  |  |
2014 |  | 190,832 |  |  | 25.21 |  |  | — |  |  | — |  |  | 295 |
2015 |  | 239,679 |  |  | 16.53 |  |  | — |  |  | 193 |  |  | 498 |
2016 |  | 536,773 |  |  | 7.09 |  |  | 290 |  |  | 835 |  |  | 909 |
2017 |  | 286,251 |  |  | 13.70 |  |  | 832 |  |  | 910 |  |  | 1,325 |
2018 |  | 242,791 |  |  | 19.93 |  |  | 1,208 |  |  | 1,546 |  |  | — |
2019 |  | 270,864 |  |  | 22.25 |  |  | 1,620 |  |  | — |  |  | — |
Total |  |  |  |  |  |  |  | $ | 4,470 |  |  | $ | 4,174 |  |  | $ | 3,925 |
(a) | Represents number of awards originally issued.
Schedule of restricted stock unit activity | RSU activity for the year ended December 31, 2019 was as follows:
|  | Number of Shares |  | Weighted Average Grant-Date Fair Value
Non-vested at December 31, 2018 |  | 583,380 |  |  | $ | 15.08 |
Granted |  | 285,075 |  |  | 22.40 |
Vested |  | (348,572 | ) |  | 13.38 |
Forfeited |  | (53,274 | ) |  | 20.01 |
Non-vested at December 31, 2019 |  | 466,609 |  |  | 20.26 |
Schedule of Stock Appreciation Rights award activity | SARs activity for the year ended December 31, 2019 was as follows:
|  | Number of Shares |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in millions) (b)
Outstanding, December 31, 2018 |  | 1,745,447 |  |  | $ | 15.73 |  |  | $ | 8.9 |
Granted |  | 229,344 |  |  | 22.79 |  |  |
Exercised |  | (43,594 | ) |  | 15.87 |  |  |
Forfeited/Expired |  | (22,977 | ) |  | 26.94 |  |  |
Outstanding, December 31, 2019 |  | 1,908,220 |  |  | 16.44 |  |  | 13.0 |
(b) Intrinsic value is defined as the difference between the current market value and the exercise price, for those SARs where the market price exceeds the exercise price.
Schedule of nonvested awards activity | The following table summarizes information concerning outstanding and exercisable SARs at December 31, 2019:
|  | SARs Outstanding |  | SARs Exercisable
Range of exercisable prices |  | Vested |  | Non-vested |  | Weighted-Average Exercise Price per Share |  | Weighted-Average Remaining Contractual Life in Years |  | Number Exercisable |  | Weighted-Average Exercise Price per Share
$7.00 - $13.70 |  | 624,693 |  |  | 83,654 |  |  | $ | 9.42 |  |  | 6.65 |  | 624,693 |  |  | $ | 8.85 |
$16.53 - $22.70 |  | 584,950 |  |  | 361,000 |  |  | 19.45 |  |  | 6.60 |  | 584,950 |  |  | 18.23 |
$23.03 - $26.92 |  | 248,841 |  |  | 5,082 |  |  | 24.78 |  |  | 4.45 |  | 248,841 |  |  | 24.79 |
|  | 1,458,484 |  |  | 449,736 |  |  | 16.44 |  |  | 6.33 |  | 1,458,484 |  |  | 15.33 |
Stock Appreciation Rights (SARs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock appreciation rights valuation assumptions | he fair value of each SAR grant was estimated on the grant date using a Black-Scholes pricing model with the following assumptions:
|  | Risk-free Interest rate |  | Dividend Yield |  | Expected Life (Years) |  | Volatility |  | SAR Grant Price |  | Fair Value of SAR
March 2017 Grant |  | 2.17 | % |  | — | % |  | 6.0 |  | 43.9 | % |  | $ | 13.70 |  |  | $ | 6.13 |
March 2018 Grant |  | 2.69 | % |  | — | % |  | 6.0 |  | 44.6 | % |  | 19.80 |  |  | 9.16 |
July 2018 Grant |  | 2.87 | % |  | — | % |  | 6.0 |  | 44.7 | % |  | 24.65 |  |  | 11.48 |
March 2019 Grant |  | 2.52 | % |  | — | % |  | 6.0 |  | 46.2 | % |  | 22.51 |  |  | 10.62 |
July 2019 Grant |  | 1.84 | % |  | — | % |  | 6.0 |  | 47.1 | % |  | 27.39 |  |  | 12.80 |
Schedule of weighted-average grant-date fair value of unvested options | Weighted-average grant date fair value of non-vested SARs for the year ended December 31, 2019 was as follows:
|  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Non-vested shares, December 31, 2018 |  | 467,478 |  |  | $ | 6.65 |
Granted |  | 229,344 |  |  | 10.75 |
Vested |  | (233,842 | ) |  | 5.17 |
Forfeited |  | (13,244 | ) |  | 12.80 |
Non-vested shares, December 31, 2019 |  | 449,736 |  |  | 9.32 |
Performance Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock appreciation rights valuation assumptions | The fair value of PSUs granted was estimated on the grant date using a Monte Carlo pricing model with the following assumptions:
|  | Risk-free Interest rate |  | Dividend Yield |  | Expected Life (Years) |  | Volatility |  | Fair Value of PSU
March 2017 Grant |  | 1.54 | % |  | — | % |  | 2.83 |  | 34.2 | % |  | $ | 17.05 |
March 2018 Grant |  | 2.36 | % |  | — | % |  | 2.83 |  | 34.7 | % |  | 29.56 |
July 2018 Grant |  | 2.69 | % |  | — | % |  | 2.42 |  | 33.1 | % |  | 39.06 |
March 2019 Grant |  | 2.48 | % |  | — | % |  | 2.82 |  | 33.8 | % |  | 29.04 |
July 2019 Grant |  | 1.75 | % |  | — | % |  | 2.50 |  | 34.3 | % |  | 40.07 |
August 2019 Grant |  | 1.57 | % |  | — | % |  | 2.41 |  | 34.9 | % |  | 23.38 |
Schedule of weighted-average grant-date fair value of unvested options | A summary of the Company's non-vested PSU activity during the year ending December 31, 2019 was as follows:
|  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Non-vested shares, December 31, 2018 |  | 494,882 |  |  | $ | 23.13 |
Granted |  | 277,307 |  |  | 28.51 |
Forfeited |  | (70,391 | ) |  | 26.23 |
Vested, not issued (c) |  | (236,214 | ) |  | 17.05 |
Non-vested shares, December 31, 2019 |  | 465,584 |  |  | 28.95 |

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