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Retirement and Long-term Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share Based Payments And Retirement Disclosure [Abstract] |
Summary of Restricted Stock Awards Activity | A summary of activity for our restricted stock awards for 2019, 2018 and 2017 is as follows:
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value Per Share |
Restricted shares, beginning of period |  |  | 526,438 |  |  | $ | 11.56 |  |  |  | 445,126 |  |  | $ | 12.83 |  |  |  | 370,565 |  |  | $ | 12.99 |
Granted |  |  | 170,936 |  |  |  | 6.09 |  |  |  | 440,185 |  |  |  | 11.16 |  |  |  | 383,121 |  |  |  | 13.02 |
Vested |  |  | (255,449 | ) |  |  | 11.41 |  |  |  | (250,219 | ) |  |  | 10.93 |  |  |  | (215,478 | ) |  |  | 12.52 |
Forfeited |  |  | (155,777 | ) |  |  | 11.81 |  |  |  | (108,654 | ) |  |  | 12.01 |  |  |  | (93,082 | ) |  |  | 12.53 |
Restricted shares, end of period |  |  | 286,148 |  |  |  | 8.30 |  |  |  | 526,438 |  |  |  | 11.56 |  |  |  | 445,126 |  |  |  | 12.83 |

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- Definition Share-based Payments and Retirement Disclosure [Abstract] + References No definition available. + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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