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STOCK-BASED COMPENSATION AND INCENTIVE PLANS (Tables) | 12 Months Ended
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Dec. 31, 2019
Schedule of Common Stock Shares Reserved for Issuance and Shares Available for Grant | The number of common stock shares reserved for issuance under the plans and the number of shares available for future grants are as follows:
|  | Successor |  |  |  | Predecessor |
|  |  |  |  |  |  |  |  |  | Period from |  |  |  | Period from |
|  | Year |  |  | Year |  |  | August 1, 2017 |  |  |  | April 1, 2017 |
|  | Ended |  |  | Ended |  |  | through |  |  |  | through |
|  | December 31, 2019 |  |  | December 31, 2018 |  |  | December 31, 2017 |  |  |  | July 31, 2017 |
Shares of common stock reserved for issuance under the plans |  |  | 3,973,228 |  |  |  | 3,973,228 |  |  |  | 3,048,877 |  |  |  |  | — |
Shares of common stock available for future grants |  |  | 2,187,101 |  |  |  | 2,325,102 |  |  |  | 1,891,231 |  |  |  |  | — |
Restricted Stock Units (RSUs) |
Summary Of Restricted Stock Unit Activity | The following table sets forth a summary of our restricted stock unit activity:
|  | Weighted-average Grant-Date Fair Value |  |  | Time Based Units |  |  | Weight-average Grant Date Fair Value |  |  | Performance Based Units |
Non-vested balance at March 31, 2017 (Predecessor) |  | $ | 54.48 |  |  |  | 183 |  |  |  | — |  |  |  | — |
Vested |  |  | 54.48 |  |  |  | (183 | ) |  |  | — |  |  |  | — |
Non-vested balance at August 1, 2017 (Successor) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Granted |  |  | 24.40 |  |  |  | 1,203,379 |  |  |  | — |  |  |  | — |
Cancelled/forfeited |  |  | 24.15 |  |  |  | (45,733 | ) |  |  | — |  |  |  | — |
Non-vested balance at December 31, 2017 (Successor) |  |  | 24.41 |  |  |  | 1,157,646 |  |  |  | — |  |  |  | — |
Granted |  |  | 24.58 |  |  |  | 455,063 |  |  |  | 26.04 |  |  |  | 63,365 |
Vested |  |  | 24.84 |  |  |  | (503,677 | ) |  |  | — |  |  |  | — |
Cancelled/forfeited |  |  | 27.15 |  |  |  | (27,948 | ) |  |  | — |  |  |  | — |
Non-vested balance at December 31, 2018 (Successor) |  |  | 24.21 |  |  |  | 1,081,084 |  |  |  | 26.04 |  |  |  | 63,365 |
Granted |  |  | 23.44 |  |  |  | 186,143 |  |  |  | 24.50 |  |  |  | 101,143 |
Vested |  |  | 24.45 |  |  |  | (784,868 | ) |  |  | — |  |  |  | — |
Cancelled/forfeited |  |  | 24.70 |  |  |  | (78,591 | ) |  |  | 24.50 |  |  |  | (70,694 | )
Non-vested balance at December 31, 2019 (Successor) |  | $ | 23.32 |  |  |  | 403,768 |  |  |  | 25.54 |  |  |  | 93,814 |
Schedule of Restricted Stock Compensation Expense and Grant Date Fair Value | Restricted stock unit compensation expense and grant date fair value are as follows:
|  | Successor |  |  |  | Predecessor |
|  |  |  |  |  |  |  |  |  | Period from |  |  |  | Period from |
|  | Year |  |  | Year |  |  | August 1, 2017 |  |  |  | April 1, 2017 |
|  | Ended |  |  | Ended |  |  | through |  |  |  | through |
(In thousands) |  | December 31, 2019 |  |  | December 31, 2018 |  |  | December 31, 2017 |  |  |  | July 31, 2017 |
Grant date fair value of restricted stock units vested |  | $ | 19,193 |  |  |  | 12,513 |  |  |  | — |  |  |  |  | 10 |
Restricted stock unit compensation expense |  |  | 19,603 |  |  |  | 13,406 |  |  |  | 3,731 |  |  |  |  | 2 |
Phantom Stock Plan |
Schedule of Restricted Stock Compensation Expense and Grant Date Fair Value | Phantom stock compensation expense and grant date fair value of phantom stock vested are as follows:
|  | Successor |  |  |  | Predecessor |
|  |  |  |  |  |  |  |  |  | Period from |  |  |  | Period from |
|  | Year |  |  | Year |  |  | August 1, 2017 |  |  |  | April 1, 2017 |
|  | Ended |  |  | Ended |  |  | through |  |  |  | through |
(In thousands) |  | December 31, 2019 |  |  | December 31, 2018 |  |  | December 31, 2017 |  |  |  | July 31, 2017 |
Grant date fair value of phantom stock vested | $ |  | 1,055 |  |  |  | 2,957 |  |  |  | — |  |  |  |  | — |
Phantom stock compensation expense |  | 30 |  |  |  | 214 |  |  |  | 94 |  |  |  |  | 68 |
Summary of Phantom Stock Activity | The following table sets forth a summary of our phantom stock activity:
|  | Weighted-average Grant-Date Fair Value |  |  | Time Based Shares |  |  | Weighted-average Grant-Date Fair Value |  |  | Series A Warrants |  |  | Weighted-average Grant-Date Fair Value |  |  | Series B Warrants |
Non-vested balance at March 31, 2017 (Predecessor) |  | $ | 9.74 |  |  |  | 946,150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancelled |  |  | 9.70 |  |  |  | (484,446 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited |  |  | 10.08 |  |  |  | (16,866 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested balance at July 31, 2017 (Predecessor) |  | $ | 9.77 |  |  |  | 444,838 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Successor phantom stock at August 1, 2017 |  |  | 308.19 |  |  |  | 14,160 |  |  |  | 1.00 |  |  |  | 22,963 |  |  |  | 0.98 |  |  |  | 24,824 |
Cancelled/forfeited |  |  | 307.31 |  |  |  | (634 | ) |  |  | 1.00 |  |  |  | (1,029 | ) |  |  | 0.98 |  |  |  | (1,112 | )
Non-vested balance at December 31, 2017 (Successor) |  | $ | 308.24 |  |  |  | 13,526 |  |  |  | 1.00 |  |  |  | 21,934 |  |  |  | 0.98 |  |  |  | 23,712 |
Vested |  |  | 360.14 |  |  |  | (8,223 | ) |  |  | 1.00 |  |  |  | (13,009 | ) |  |  | 0.98 |  |  |  | (14,064 | )
Cancelled |  |  | 240.39 |  |  |  | (786 | ) |  |  | 1.00 |  |  |  | (1,275 | ) |  |  | 0.98 |  |  |  | (1,379 | )
Non-vested balance at December 31, 2018 (Successor) |  | $ | 226.50 |  |  |  | 4,517 |  |  |  | 1.00 |  |  |  | 7,650 |  |  |  | 2.94 |  |  |  | 8,269 |
Vested |  |  | 226.50 |  |  |  | (4,517 | ) |  |  | 1.00 |  |  |  | (7,650 | ) |  |  | 2.94 |  |  |  | (8,269 | )
Non-vested balance at December 31, 2019 (Successor) |  | $ | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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