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Income Taxes - Deferred income tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Compensation accruals | $ 3,489 | $ 3,042
Reserves | 2,940 | 2,149
Other | 127 | 0
Net operating losses | 10,010 | 10,099
Interest rate swaps | 666 | 866
Energy efficiency | 28,911 | 22,716
Interest limitation | 3,292 | 0
Deferred revenue | 1,943 | 815
Gross deferred income tax assets | 51,378 | 39,687
Valuation allowance | (7,931) | (7,534)
Total deferred income tax assets | 43,447 | 32,153
Deferred tax liabilities: |  |
Depreciation | (37,107) | (24,178)
Deferred effect of derivative liability and ASU 2016-09 adoption | (475) | 0
Outside basis difference | (7,488) | (4,408)
Other | 0 | (193)
Total deferred income tax liabilities | (47,799) | (32,737)
Deferred income tax liabilities, net | (4,352) | (584)
Canada |  |
Deferred tax liabilities: |  |
Foreign Authority | (1,974) | (3,156)
United Kingdom goodwill amortization |  |
Deferred tax liabilities: |  |
Foreign Authority | $ (755) | $ (802)

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