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RETIREMENT AND LONG-TERM INCENTIVE PLANS (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Payments and Retirement Disclosure [Abstract] |
Summary of Restricted Stock Awards Activity | A summary of our restricted stock awards activity for the years ended December 31, 2017, 2016 and 2015 is presented in the table below.
| 2017 |  | 2016 |  | 2015
| 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 at the beginning of period | 370,565 |  |  | $ | 12.99 |  |  | 262,964 |  |  | $ | 18.33 |  |  | 107,840 |  |  | $ | 24.27 |
Granted | 383,121 |  |  | 13.02 |  |  | 259,699 |  |  | 8.55 |  |  | 215,034 |  |  | 16.33 |
Vested | (215,478 | ) |  | 12.52 |  |  | (114,804 | ) |  | 14.37 |  |  | (41,112 | ) |  | 22.04 |
Forfeited | (93,082 | ) |  | 12.53 |  |  | (37,294 | ) |  | 15.48 |  |  | (18,798 | ) |  | 21.39 |
Restricted shares at the end of period | 445,126 |  |  | $ | 12.83 |  |  | 370,565 |  |  | $ | 12.99 |  |  | 262,964 |  |  | $ | 18.33 |

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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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