Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Effective Tax Rates (Details)

v3.8.0.1
Income Taxes - Reconciliation of Effective Tax Rates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Income before (benefit) provision for income taxes $ 28,717 $ 16,367 $ 292
Federal statutory tax expense 10,048 5,728 102
State income taxes, net of Federal benefit 1,584 678 604
Net state impact of deferred rate change 327 (110) 55
Non deductible expenses 1,473 670 933
Impact of reserve for uncertain tax positions 42 (411) (1,772)
Stock-based compensation expense 116 306 402
Energy efficiency preferences (6,416) (4,130) (3,280)
Foreign items and rate differential 139 516 1,556
Tax rate change (13,948) 0 0
Valuation allowance 424 213 4,255
Energy partnership basis adjustments 0 0 2,133
Miscellaneous 1,420 910 (12)
Income tax (benefit) provision $ (4,791) $ 4,370 $ 4,976
Effective tax rate:      
Federal statutory rate expense 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 5.50% 4.10% 206.80%
Net state impact of deferred rate change 1.10% (0.70%) 18.80%
Non deductible expenses 5.10% 4.10% 319.50%
Impact of reserve for uncertain tax positions 0.10% (2.50%) (606.80%)
Stock-based compensation expense 0.40% 1.90% 137.70%
Energy efficiency preferences (22.30%) (25.20%) (1123.30%)
Foreign items and rate differential 0.50% 3.20% 532.90%
Tax rate change (48.60%) 0.00% 0.00%
Valuation allowance 1.50% 1.30% 1457.20%
Energy partnership basis adjustments 0.00% 0.00% 730.50%
Miscellaneous 4.90% 5.50% (4.10%)
Effective tax rate (16.70%) 26.70% 1704.20%