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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Deferred income tax assets: |  |
Compensation accruals | $ 3,306 | $ 2,570
Reserves | 4,111 | 4,150
Sale-leasebacks and other accruals | 32,945 | 27,806
Net operating losses | 18,395 | 28,807
Interest rate swaps | 0 | 1,928
Energy efficiency | 71,433 | 59,618
Deferred revenue | 2,132 | 2,181
Gross deferred income tax assets | 132,322 | 127,060
Valuation allowance | (3,621) | (4,039)
Total deferred income tax assets | 128,701 | 123,021
Deferred income tax liabilities: |  |
Depreciation | (122,762) | (112,896)
Deferred effect of derivative liability | (1,640) | (1,541)
Outside basis difference | (5,038) | (7,050)
Interest rate swaps | (1,347) | 0
Total deferred income tax liabilities | (134,837) | (123,189)
Deferred income tax liabilities, net | (6,136) | (168)
Canada |  |
Deferred income tax liabilities: |  |
Foreign Authority | (3,098) | (984)
United Kingdom |  |
Deferred income tax liabilities: |  |
Foreign Authority | $ (952) | $ (718)

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