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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Summary of Company Stock Awards | A summary of the status of the Company’s nonvested restricted stock awards as of December 31, 2017, and changes during the year ended December 31, 2017, is presented below:
| Shares |  | Weighted- Average Grant-Date Fair Value
Nonvested at January 1, 2017 | 602,162 |  |  | $ | 15.41 |
Granted | 326,739 |  |  | $ | 10.75 |
Vested | (276,467 | ) |  | $ | 15.07 |
Forfeited | (10,075 | ) |  | $ | 12.97 |
Nonvested at December 31, 2017 | 642,359 |  |  | $ | 13.23 |
Schedule of PSU Activity | The Company granted the following PSUs in the first quarter of the respective years. A summary of PSU activity as of December 31, 2017, and changes during the year ended December 31, 2017, is presented below:
| PSUs |  | Weighted-Average Grant Date Fair Value
2015 PSUs granted | 138,680 |  |  | $ | 15.52 |
2016 PSUs granted | 282,995 |  |  | $ | 4.98 |
Outstanding at January 1 , 2017 | 421,675 |  |  | $ | 8.45 |
2017 PSUs granted | 277,376 |  |  | $ | 6.86 |
2015 PSUs canceled (1) | (138,680 | ) |  | $ | 15.52 |
Outstanding at December 31, 2017 (2) | 560,371 |  |  | $ | 5.91 |
(1) | Based on the Company's TSR relative to the NAREIT Retail Index for the three-year performance period ended December 31, 2017, none of the 2015 PSU were earned as of December 31, 2017.
(2) | None of the PSUs outstanding at December 31, 2017 were vested.
Summary of Assumptions used in the Monte Carlo Simulation Pricing Models | The following table summarizes the assumptions used in the Monte Carlo simulation pricing model related to the 2017 PSUs and the 2016 PSUs:
| 2017 PSUs |  | 2016 PSUs
Grant date | February 7, 2017 |  | February 10, 2016
Fair value per share on valuation date (1) | $ | 6.86 |  |  | $ | 4.98 |
Risk-free interest rate (2) | 1.53 | % |  | 0.92 | %
Expected share price volatility (3) | 32.85 | % |  | 30.95 | %
(1) | The value of the PSU awards is estimated on the date of grant using a Monte Carlo Simulation model. The valuation consisted of computing the fair value using CBL's simulated stock price as well as TSR over a three-year performance period. The award is modeled as a contingent claim in that the expected return on the underlying shares is risk-free and the rate of discounting the payoff of the award is also risk-free. The weighted-average fair value per share related to the 2017 PSUs consists of 115,082 shares at a fair value of $5.62 per share and 162,294 shares at a fair value of $7.74 per share.
(2) | The risk-free interest rate was based on the yield curve on zero-coupon U.S. Treasury securities in effect as of the valuation date.
(3) | The computation of expected volatility was based on a blend of the historical volatility of CBL's shares of common stock based on annualized daily total continuous returns over a three-year period and implied volatility data based on the trailing month average of daily implied volatilities implied by stock call option contracts that were both closest to the terms shown and closest to the money.

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