Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Effective Tax Rates (Details)

v3.10.0.1
Income Taxes - Reconciliation of Effective Tax Rates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income before (benefit) provision for income taxes $ 42,390 $ 28,717 $ 16,367
Federal statutory tax expense 8,902 10,048 5,728
State income taxes, net of Federal benefit 3,071 1,584 678
Net state impact of deferred rate change 174 327 (110)
Non deductible expenses 982 1,473 670
Impact of reserve for uncertain tax positions 879 42 (411)
Stock-based compensation expense (441) 116 306
Energy efficiency preferences (8,636) (6,416) (4,130)
Foreign items and rate differential (41) 139 516
Tax rate change 0 (13,948) 0
Valuation allowance 641 424 213
Miscellaneous (718) 1,420 910
Income tax (benefit) provision $ 4,813 $ (4,791) $ 4,370
Effective tax rate:      
Federal statutory rate expense 21.00% 35.00% 35.00%
State income taxes, net of federal benefit 7.20% 5.50% 4.10%
Net state impact of deferred rate change 0.40% 1.10% (0.70%)
Non deductible expenses 2.30% 5.10% 4.10%
Impact of reserve for uncertain tax positions 2.10% 0.10% (2.50%)
Stock-based compensation expense (1.00%) 0.40% 1.90%
Energy efficiency preferences (20.40%) (22.30%) (25.20%)
Foreign items and rate differential (0.10%) 0.50% 3.20%
Tax rate change 0.00% (48.60%) 0.00%
Valuation allowance 1.50% 1.50% 1.30%
Miscellaneous (1.60%) 4.90% 5.50%
Effective tax rate 11.40% (16.70%) 26.70%