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Income Taxes - Deferred income tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax assets:    
Compensation accruals $ 2,485 $ 1,745
Reserves 3,861 2,739
Other 15,621 9,398
Net operating losses 14,435 14,355
Interest rate swaps 2,587 1,604
Energy efficiency 42,046 35,939
Interest limitation 0 5,148
Deferred revenue 1,270 1,635
Gross deferred income tax assets 82,305 72,563
Valuation allowance (3,877) (8,583)
Total deferred income tax assets 78,428 63,980
Deferred income tax liabilities:    
Depreciation (66,694) (51,579)
Deferred effect of derivative liability (284) (328)
Outside basis difference (10,886) (8,488)
Total deferred income tax liabilities (80,791) (64,095)
Deferred income tax liabilities, net (2,363) (115)
Canada    
Deferred income tax liabilities:    
Foreign Authority (2,195) (2,919)
United Kingdom    
Deferred income tax liabilities:    
Foreign Authority $ (732) $ (781)