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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2022
INCOME TAXES |
Schedule of provision for (benefit from) income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
Current tax provision (benefit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. federal | ​ | $ | — | ​ | $ | (1) | ​ | $ | (99)
State | ​ |  | 1,064 | ​ |  | 366 | ​ |  | 326
Total current | ​ | ​ | 1,064 | ​ | ​ | 365 | ​ | ​ | 227
Deferred tax provision (benefit): | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
U.S. federal | ​ | ​ | 14,320 | ​ | ​ | 8,800 | ​ | ​ | (17,246)
State | ​ |  | 909 | ​ |  | 1,579 | ​ |  | (518)
Total deferred | ​ | ​ | 15,229 | ​ | ​ | 10,379 | ​ | ​ | (17,764)
Provision for (benefit from) income taxes | ​ | $ | 16,293 | ​ | $ | 10,744 | ​ | $ | (17,537)
​
Schedule of provision for (benefit from) income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021 |  | 2020
Income taxes at U.S. federal statutory rate |  | $ | 12,724 |  | $ | 8,182 |  | $ | (18,056)
Net state income taxes | ​ |  | 1,795 | ​ |  | 1,374 | ​ |  | (817)
Tax credits | ​ |  | (26) | ​ |  | (720) | ​ |  | (1,256)
Unrecognized tax benefits (1) | ​ |  | 17 | ​ |  | 598 | ​ |  | 772
Valuation allowances and write off of tax attributes (2) | ​ |  | (68) | ​ |  | (167) | ​ |  | 236
Executive compensation limitation | ​ |  | 1,901 | ​ |  | 1,559 | ​ |  | 1,159
Stock | ​ |  | 152 | ​ |  | 162 | ​ |  | 538
Other | ​ |  | (202) | ​ |  | (244) | ​ |  | (113)
Provision for (benefit from) income taxes | ​ | $ | 16,293 | ​ | $ | 10,744 | ​ | $ | (17,537)
(1) | Includes the expiration of statute of limitations. See “Unrecognized Tax Benefits” below for further details.
(2) | See “Tax Attributes and Valuation Allowances” below for further details.
Schedule of deferred income tax balances | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
Deferred tax assets: |  | ​ |  |  | ​ |
Net operating loss carryforwards | ​ | $ | 191,916 | ​ | $ | 196,654
Interest expense limitation carryforward | ​ |  | 19,327 | ​ |  | —
Accrued liabilities | ​ |  | 4,979 | ​ |  | 4,527
Other | ​ |  | 12,834 | ​ |  | 12,503
​ | ​ | ​ | 229,056 | ​ | ​ | 213,684
Valuation allowances (1) | ​ |  | (607) | ​ |  | (735)
Total deferred tax assets | ​ | ​ | 228,449 | ​ | ​ | 212,949
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ |  |  | ​ |  |
Property, plant and equipment | ​ | ​ | (8,386) | ​ | ​ | (7,762)
Basis difference in the Partnership | ​ |  | (181,377) | ​ |  | (151,469)
Other | ​ |  | (6,187) | ​ |  | (6,975)
Total deferred tax liabilities | ​ |  | (195,950) | ​ |  | (166,206)
​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax asset (2) | ​ | $ | 32,499 | ​ | $ | 46,743
(1) | See “Tax Attributes and Valuation Allowances” below for further details.
(2) | The 2022 net deferred tax assets are reflected in our consolidated balance sheets as deferred tax assets of $33.4 million and $47.9 million, respectively, and deferred tax liabilities of $0.9 million and $1.1 million, respectively.
Schedule of changes in valuation allowance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021 |  | 2020
Balance at beginning of period |  | $ | (735) |  | $ | (1,027) |  | $ | (822)
Additions to valuation allowance | ​ | ​ | (88) | ​ | ​ | — | ​ | ​ | (205)
Reductions to valuation allowance | ​ | ​ | 216 | ​ | ​ | 292 | ​ | ​ | —
Balance at end of period | ​ | $ | (607) | ​ | $ | (735) | ​ | $ | (1,027)
Schedule of changes in unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021 |  | 2020
Beginning balance |  | $ | 19,594 |  | $ | 18,892 |  | $ | 18,453
Additions based on tax positions related to current year | ​ |  | 2,151 | ​ |  | 2,246 | ​ |  | 2,397
Additions based on tax positions related to prior years | ​ |  | 6 | ​ |  | 632 | ​ |  | —
Reductions based on tax positions related to prior years | ​ |  | (105) | ​ |  | (138) | ​ |  | (73)
Reductions based on lapse of statute of limitations | ​ |  | (1,995) | ​ |  | (2,038) | ​ |  | (1,885)
Ending balance | ​ | $ | 19,651 | ​ | $ | 19,594 | ​ | $ | 18,892
​

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