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STOCK BASED AND DEFERRED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Nonvested (Restricted) Shares and Units Activity | In addition to the stock options discussed above, we grant time-based and performance-based restricted shares or units. Performance-based restricted shares are only granted to executive officers. All performance shares only vest upon the attainment of certain financial and operational criteria as established and approved by our Board of Directors.
|  | Nonvested Restricted Share Activity (time-based) |  | Weighted Average Grant Date Fair Value |  | Nonvested Restricted Share Activity (performance- based) |  | Weighted Average Grant Date Fair Value
Outstanding at January 1, 2016 |  | 883,707 |  |  | $ | 40.75 |  |  | 180,770 |  |  | $ | 42.93 |
Granted |  | 499,865 |  |  | 31.60 |  |  | 66,698 |  |  | 34.39 |
Vested (Earned/Released) |  | (305,359 | ) |  | 30.87 |  |  | (41,665 | ) |  | 31.02 |
Forfeited (1) |  | (115,910 | ) |  | 36.79 |  |  | (20,835 | ) |  | 42.56 |
Outstanding as of December 31, 2016 |  | 962,303 |  |  | 37.00 |  |  | 184,968 |  |  | 34.84 |
Granted |  | 430,575 |  |  | 34.45 |  |  | 154,120 |  |  | 34.10 |
Vested (Earned/Released) |  | (279,856 | ) |  | 38.39 |  |  | (20,367 | ) |  | 45.60 |
Forfeited (1) |  | (130,370 | ) |  | 35.09 |  |  | (31,716 | ) |  | 45.60 |
Outstanding at December 31, 2017 |  | 982,652 |  |  | 35.59 |  |  | 287,005 |  |  | 35.80 |
Granted |  | 315,247 |  |  | 46.07 |  |  | 157,637 |  |  | 45.20 |
Vested (Earned/Released) |  | (288,709 | ) |  | 37.93 |  |  | (36,801 | ) |  | 41.17 |
Forfeited (1) |  | (85,900 | ) |  | 37.53 |  |  | (29,386 | ) |  | 41.17 |
Outstanding at December 31, 2018 |  | 923,290 |  |  | $ | 38.25 |  |  | 378,455 |  |  | $ | 38.77 |
(1) | Forfeitures on time-based nonvested shares are a result of terminations of employment, while forfeitures on performance-based nonvested shares are a result of failing to attain certain goals as outlined in our executive officers' compensation agreements.
Summary of Compensation Expense and Stock Award Activity | Below is a summary of compensation expense and stock award activity (in thousands):
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Stock-based compensation expense |  | $ | 17,170 |  |  | $ | 12,056 |  |  | $ | 13,741 |
Cash received by Company from stock option exercises |  | $ | — |  |  | $ | — |  |  | $ | 232 |
Summary of Additional Information Regarding Stock Plan | The following table includes additional information regarding our Plan (dollars in thousands):
|  | At December 31,
|  | 2018 |  | 2017
Unrecognized stock-based compensation cost |  | $ | 24,954 |  |  | $ | 18,439 |
Weighted average years expense recognition period |  | 2.24 |  |  | 2.48 |
Total equity awards outstanding |  | 1,301,745 |  |  | 1,269,657 |

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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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