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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Deferred revenue | $ 0 | $ 3,907
Net operating loss carry-forwards | 12,612 | 14,983
Accruals and reserves | 6,545 | 5,189
Pension benefits | 2,873 | 3,556
Asset retirement obligations | 7,797 | 4,608
Total gross deferred tax assets | 29,827 | 32,243
Less valuation allowance | (862) | (862)
Net deferred tax assets | 28,965 | 31,381
Deferred tax liabilities: |  |
Deferred revenue | 19,554 | 0
Plant-in-service | 99,666 | 89,494
Intangible assets | 32,963 | 37,682
Interest rate swaps | 3,339 | 3,511
Other, net | 896 | 1,573
Total gross deferred tax liabilities | 156,418 | 132,260
Net deferred tax liabilities | $ 127,453 | $ 100,879

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