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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred tax assets: |  |  |
Leases | $ 106,564 |  | $ 0
Asset retirement obligations | 9,957 |  | 7,797
Net operating loss carry-forwards | 10,071 | $ 10,100 | 12,612
Pension liabilities | 3,161 |  | 2,873
Accruals and stock based compensation | 1,935 |  | 6,545
Other | 1,408 |  | 0
Total gross deferred tax assets | 133,096 |  | 29,827
Less valuation allowance | 0 |  | (862)
Net deferred tax assets | 133,096 |  | 28,965
Deferred tax liabilities: |  |  |
Property, plant and equipment | 110,297 |  | 99,902
Leases | 105,475 |  | 0
Intangible assets | 27,201 |  | 32,727
Prepaid assets and other | 26,574 |  | 23,789
Total gross deferred tax liabilities | 269,547 |  | 156,418
Net deferred tax liabilities | $ 136,451 |  | $ 127,453

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