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Share-based Compensation and Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Share-Based Compensation Expense | Share-based compensation expense was as follows:
For the years ended December 31, | 2019 |  | 2018 |  | 2017
Continuing operations |  |  |  |  |
Stock options, net of estimated forfeitures | $ | 3,702 |  |  | $ | (3,026 | ) |  | $ | 48,601 |
Restricted stock awards | 8,959 |  |  | 12,764 |  |  | 13,243 |
Total continuing operations | $ | 12,661 |  |  | $ | 9,738 |  |  | $ | 61,844 |
Discontinued operations |  |  |  |  |
Share-based compensation expense for discontinued operations | 333 |  |  | 1,053 |  |  | 2,944 |
Total continuing and discontinued operations | $ | 12,994 |  |  | $ | 10,791 |  |  | $ | 64,788 |
Summary of Stock Options Activity | The following tables summarize the stock option activity and the assumptions used to record the related share-based compensation expense for the years ended December 31, 2019, 2018 and 2017:
|  | 2019 |  | 2018 |  | 2017
|  | Options | Weighted Average Exercise Price | Aggregate Intrinsic Value |  | Options | Weighted Average Exercise Price | Aggregate Intrinsic Value |  | Options | Weighted Average Exercise Price | Aggregate Intrinsic Value
Outstanding at January 1 |  | 9,020 |  | $ | 18.79 |  | $ | 744 |  |  | 9,903 |  | $ | 19.30 |  | $ | — |  |  | 10,928 |  | $ | 21.81 |  | $ | 4,350 |
Granted |  | 698 |  | 14.99 |  |  |  | 717 |  | 14.27 |  |  |  | 4,283 |  | 19.01 |  |
Exercised |  | (1,569 | ) | 16.95 |  | 794 |  |  | — |  | — |  | — |  |  | — |  | — |  | — |
Forfeited or expired |  | (2,761 | ) | 20.06 |  |  |  | (1,600 | ) | 19.92 |  |  |  | (5,308 | ) | 18.34 |  |
Outstanding at December 31 |  | 5,388 |  | 18.18 |  | 3,396 |  |  | 9,020 |  | 18.79 |  | 744 |  |  | 9,903 |  | 19.30 |  | — |
Exercisable at December 31 |  | 4,846 |  | 18.50 |  | 2,136 |  |  | 7,878 |  | 19.11 |  | 265 |  |  | 8,606 |  | 19.38 |  | — |
Vested and expected to vest |  | 5,274 |  | 18.20 |  | 3,344 |  |  | 8,990 |  | 18.80 |  | 722 |  |  | 9,847 |  | 19.31 |  | — |
Summary of Stock Option Plans, By Exercise Price Range |
| Options Outstanding |  | Options Exercisable |  | Assumption Range*
Exercise Prices | Number of Shares | Weighted Average Remaining Contractual Terms (Years) |  | Number of Shares | Weighted Average Remaining Contractual Terms (Years) |  | Risk-Free Interest Rate | Expected Terms in Years | Expected Volatility
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |
$13.97 - $15.55 | 944 |  | 7.89 |  | 524 |  | 7.06 |  | 1.81% - 3.05% | 3.25 - 5.91 | 38.29% - 64.18%
$17.00 - $19.56 | 3,597 |  | 3.12 |  | 3,475 |  | 2.95 |  | 1.38% - 2.94% | 2.60 - 10.00 | 35.20% - 58.84%
$21.00 - $21.52 | 330 |  | 1.09 |  | 330 |  | 1.09 |  | 0.68% - 2.61% | 3.79 - 6.55 | 38.16% - 57.79%
$22.32 - $31.92 | 517 |  | 1.44 |  | 517 |  | 1.44 |  | 0.60% - 3.03% | 3.18 - 6.52 | 36.93% - 53.80%
Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |
$13.97 - $15.55 | 674 |  | 8.31 |  | 250 |  | 7.98 |  | 1.81% - 3.05% | 3.25 - 5.91 | 49.98% - 64.18%
$17.00 - $19.56 | 5,730 |  | 3.69 |  | 5,013 |  | 3.50 |  | 0.49% - 2.94% | 2.60 - 10.00 | 36.04% - 69.74%
$21.00 - $21.52 | 1,917 |  | 1.39 |  | 1,916 |  | 1.39 |  | 0.68% - 2.60% | 2.92 - 6.52 | 38.16% - 69.74%
$22.32 - $31.92 | 699 |  | 2.53 |  | 699 |  | 2.53 |  | 0.60% - 2.93% | 4.00 - 6.52 | 36.93% - 53.80%
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |
$14.58 - $19.56 | 6,500 |  | 4.58 |  | 5,549 |  | 4.22 |  | 0.33% - 3.31% | 2.03 -10.00 | 32.18% - 69.74%
$21.00 - $21.28 | 693 |  | 2.18 |  | 347 |  | 0.66 |  | 0.43% - 3.60% | 2.11 - 6.67 | 33.24% - 57.79%
$21.32 - $21.52 | 1,776 |  | 2.14 |  | 1,776 |  | 2.14 |  | 0.68% - 2.61% | 3.38 - 6.55 | 38.16% - 69.74%
$21.68 - $22.32 | 221 |  | 1.94 |  | 221 |  | 1.94 |  | 0.57% - 3.03% | 2.18 - 6.52 | 36.78% - 52.47%
$22.88 - $31.92 | 713 |  | 3.76 |  | 713 |  | 3.76 |  | 0.73% - 2.86% | 4.00 - 6.52 | 39.03% - 53.80%
* The expected dividend yield is zero for all options in all years.
Summary of Non-Vested Restricted Stock And Restricted Stock Units Activity | The following table summarizes the non-vested restricted stock and restricted stock units activity for the years ended December 31, 2019, 2018 and 2017:
|  | 2019 |  | 2018 |  | 2017
|  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Non-vested at January 1 |  | 1,895 |  |  | $ | 15.31 |  |  | 1,650 |  |  | $ | 19.74 |  |  | 1,038 |  |  | $ | 25.97 |
Granted |  | 1,003 |  |  | 15.10 |  |  | 1,306 |  |  | 14.11 |  |  | 1,337 |  |  | 16.65 |
Vested |  | (765 | ) |  | 16.18 |  |  | (853 | ) |  | 21.66 |  |  | (328 | ) |  | 22.35 |
Forfeited |  | (882 | ) |  | 15.20 |  |  | (208 | ) |  | 17.41 |  |  | (397 | ) |  | 23.33 |
Non-vested at December 31 |  | 1,251 |  |  | 14.69 |  |  | 1,895 |  |  | 15.31 |  |  | 1,650 |  |  | 19.74 |

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