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Common Stock and Stock-Based Awards Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock Options | The following table summarizes activities related to the Company’s stock options:
(in thousands, except per share data) |  | Number of Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding as of December 31, 2017 |  |  | 596 |  |  | $ | 19.72 |  |  |  |  |  |  |  |  |
Exercised |  |  | (200 | ) |  |  | 18.21 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (22 | ) |  |  | 22.99 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2018 |  |  | 374 |  |  |  | 20.35 |  |  |  |  |  |  |  |  |
Exercised |  |  | (100 | ) |  |  | 21.21 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (4 | ) |  |  | 21.29 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2019 |  |  | 270 |  |  |  | 20.02 |  |  |  |  |  |  |  |  |
Exercised |  |  | (76 | ) |  |  | 19.87 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (6 | ) |  |  | 23.08 |  |  |  |  |  |  |  |  |
Outstanding and Exercisable as of December 31, 2020 |  |  | 188 |  |  | $ | 19.98 |  |  |  | 2.55 |  |  | $ | 1,324 |
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock-Based Awards | The following table summarizes the activities related to the Company’s time-based restricted stock units:
(in thousands, except per share data) |  | Number of Units |  |  | Weighted- Average Grant Date Fair Value |
Non-vested awards outstanding as of December 31, 2017 |  |  | 593 |  |  | $ | 27.47 |
Granted |  |  | 407 |  |  |  | 29.44 |
Vested |  |  | (306 | ) |  |  | 27.25 |
Forfeited |  |  | (99 | ) |  |  | 27.52 |
Non-vested awards outstanding as of December 31, 2018 |  |  | 595 |  |  |  | 28.93 |
Granted |  |  | 632 |  |  |  | 27.36 |
Vested |  |  | (254 | ) |  |  | 28.09 |
Forfeited |  |  | (80 | ) |  |  | 28.97 |
Non-vested awards outstanding as of December 31, 2019 |  |  | 893 |  |  |  | 28.06 |
Granted |  |  | 533 |  |  |  | 26.52 |
Vested |  |  | (336 | ) |  |  | 27.69 |
Forfeited |  |  | (64 | ) |  |  | 28.54 |
Non-vested awards outstanding as of December 31, 2020 |  |  | 1,026 |  |  | $ | 27.35 |
Performance-Based Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock-Based Awards | The following table summarizes the activities related to the Company’s performance-based restricted stock units:
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  | Number of |  |  | Grant Date |
(in thousands, except per share data) |  | Units |  |  | Fair Value |
Non-vested units outstanding as of December 31, 2017 |  |  | 346 |  |  | $ | 26.88 |
Granted(1) |  |  | 120 |  |  |  | 29.60 |
Forfeited |  |  | (147 | ) |  |  | 24.06 |
Non-vested units outstanding as of December 31, 2018 |  |  | 319 |  |  |  | 29.19 |
Granted(1) |  |  | 198 |  |  |  | 27.45 |
Vested |  |  | (57 | ) |  |  | 31.40 |
Forfeited |  |  | (76 | ) |  |  | 21.23 |
Non-vested units outstanding as of December 31, 2019 |  |  | 384 |  |  |  | 28.89 |
Granted(1) |  |  | 165 |  |  |  | 28.02 |
Forfeited |  |  | (181 | ) |  |  | 30.04 |
Non-vested units outstanding as of December 31, 2020 |  |  | 368 |  |  | $ | 27.93 |
(1) | Represents target number of units that can vest based on the achievement of the performance goals.

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