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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock Options Activity | The following table presents stock option activity for the years ended December 31, 2018, 2017, and 2016:
| Shares Under Options |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Expected Term
|  |  |  |  | (In years)
Outstanding at January 1, 2016 | 2,289,139 |  |  | $ | 23.89 |  |  | 6.15 |
Granted | 196,713 |  |  | 23.52 |  |  | 6.00 |
Exercised | (8,501 | ) |  | 24.46 |  |  | — |
Forfeited or expired | (5,067 | ) |  | 24.46 |  |  | — |
Outstanding at December 31, 2016 | 2,472,284 |  |  | 23.86 |  |  | 5.33 |
Granted | 137,259 |  |  | 28.36 |  |  | 6.01 |
Exercised | — |  |  | — |  |  | — |
Forfeited or expired | (5,879 | ) |  | 23.17 |  |  | — |
Outstanding at December 31, 2017 | 2,603,664 |  |  | 24.09 |  |  | 4.40 |
Granted | 2,146,885 |  |  | 21.71 |  |  | 4.58 |
Exercised | — |  |  | — |  |  | — |
Forfeited or expired | — |  |  | — |  |  | — |
Outstanding at December 31, 2018 | 4,750,549 |  |  | $ | 23.02 |  |  | 4.48 |
Exercisable at December 31, 2018 | 807,352 |  |  | $ | 24.03 |  |  | — |
Schedule of Assumptions Used to Estimate Fair Value of Options Granted | During the years ended December 31, 2018, 2017 and 2016, the fair value of the options granted was estimated on the grant date using the Black-Scholes pricing model with the following assumptions:
| February 8, 2016 |  | February 24, 2017 |  | February 22, 2018 |  | September 27, 2018
Risk-free interest rate | 1.31% |  | 1.93% |  | 2.73% |  | 3.00%
Expected option life | 6.25 |  | 6.25 |  | 6.25 |  | 7.00
Expected volatility | 23.94% |  | 25.06% |  | 32.23% |  | 30.42%
Schedule of Restricted Share Activity | The following table presents information regarding restricted share activity during the years ended December 31, 2018, 2017, and 2016:
| Shares |  | Weighted Average Grant Date Fair Value per Share
Unvested at January 1, 2016 | 30,717 |  |  | $ | 22.62 |
Granted | 117,399 |  |  | 24.55 |
Vested | (15,977 | ) |  | 23.17 |
Forfeited | (2,744 | ) |  | 23.55 |
Unvested at December 31, 2016 | 129,395 |  |  | 24.29 |
Granted | 104,698 |  |  | 27.69 |
Vested | (53,236 | ) |  | 25.13 |
Forfeited | (5,427 | ) |  | 24.64 |
Unvested at December 31, 2017 | 175,430 |  |  | 26.05 |
Granted | 103,814 |  |  | 21.65 |
Vested | (84,185 | ) |  | 25.67 |
Forfeited | (32,482 | ) |  | 23.32 |
Unvested at December 31, 2018 | 162,577 |  |  | $ | 23.99 |
Summary of Share-based Compensation Expense | Share-based compensation expense, which is included in general and administrative expenses in our consolidated statements of income, is summarized as follows:
| Year Ended December 31,
(Amounts in thousands) | 2018 |  | 2017 |  | 2016
Share-based compensation expense components: |  |  |  |  |
Restricted share expense | $ | 2,051 |  |  | $ | 1,961 |  |  | $ | 1,314 |
Stock option expense | 2,778 |  |  | 2,569 |  |  | 2,437 |
LTIP expense(1) | 2,218 |  |  | 557 |  |  | 473 |
Outperformance Plan (“OPP”) expense | 2,530 |  |  | 2,050 |  |  | 1,209 |
DSU expense | 164 |  |  | — |  |  | — |
Total Share-based compensation expense | $ | 9,741 |  |  | $ | 7,137 |  |  | $ | 5,433 |
(1) LTIP expense excludes the expense associated with LTIP units under the 2015 OPP, 2017 OPP and 2018 LTI Plan

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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