Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Effective Tax Rates (Details)

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Income Taxes - Reconciliation of Effective Tax Rates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income before (benefit) provision for income taxes $ 36,553 $ 42,390 $ 28,717
Federal statutory tax expense 7,676 8,902 10,048
State income taxes, net of federal benefit 2,140 3,071 1,584
Net state impact of deferred rate change (53) 174 327
Non deductible expenses 150 982 1,473
Impact of reserve for uncertain tax positions (925) 879 42
Stock-based compensation expense (169) (441) 116
Energy efficiency preferences (12,699) (8,636) (6,416)
Foreign items and rate differential 56 (41) 139
Redeemable non-controlling interests 1,101 70 1,579
Tax rate change 0 0 (13,948)
Valuation allowance 205 641 424
Miscellaneous (1,230) (788) (159)
Income tax (benefit) provision $ (3,748) $ 4,813 $ (4,791)
Effective tax rate:      
Federal statutory rate expense 21.00% 21.00% 35.00%
State income taxes, net of federal benefit 5.90% 7.20% 5.50%
Net state impact of deferred rate change (0.10%) 0.40% 1.10%
Non deductible expenses 0.40% 2.30% 5.10%
Impact of reserve for uncertain tax positions (2.50%) 2.10% 0.10%
Stock-based compensation expense (0.50%) (1.00%) 0.40%
Energy efficiency preferences (34.70%) (20.40%) (22.30%)
Foreign items and rate differential 0.20% (0.10%) 0.50%
Tax rate change 0.00% 0.00% (48.60%)
Redeemable non-controlling interests 3.00% 0.20% 5.50%
Valuation allowance 0.60% 1.50% 1.50%
Miscellaneous (3.60%) (1.80%) (0.50%)
Effective tax rate (10.30%) 11.40% (16.70%)