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Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 273,682 | $ 282,507 | $ 799,804 | $ 717,956
(Gain) loss on derivatives | 667 | 454 | 1,892 | 971
Interest expense, net of interest income | 4,153 | 3,279 | 10,065 | 9,909
Depreciation and amortization of intangible assets | 11,705 | 10,075 | 32,718 | 30,080
Income before taxes, excluding unallocated corporate activity | 30,984 | 30,130 | 82,840 | 63,811
U.S. Regions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 103,036 | 93,724 | 297,779 | 269,138
U.S. Federal |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 96,654 | 118,303 | 289,068 | 271,539
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 11,631 | 12,263 | 34,148 | 32,690
Non-Solar DG |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 33,811 | 28,251 | 99,750 | 74,104
All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 28,550 | 29,966 | 79,059 | 70,485
Operating Segments | U.S. Regions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 103,036 | 93,724 | 297,779 | 269,138
(Gain) loss on derivatives | (1,392) | (854) | (1,021) | (384)
Interest expense, net of interest income | 1,620 | 1,713 | 4,516 | 4,845
Depreciation and amortization of intangible assets | 4,040 | 3,337 | 11,645 | 9,297
Income before taxes, excluding unallocated corporate activity | 10,753 | 7,336 | 21,642 | 16,576
Operating Segments | U.S. Federal |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 96,654 | 118,303 | 289,068 | 271,539
(Gain) loss on derivatives | 0 | 0 | 0 | 0
Interest expense, net of interest income | 324 | 338 | 971 | 1,355
Depreciation and amortization of intangible assets | 1,237 | 995 | 3,386 | 2,954
Income before taxes, excluding unallocated corporate activity | 15,150 | 16,121 | 38,262 | 33,160
Operating Segments | Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 11,631 | 12,263 | 34,148 | 32,690
(Gain) loss on derivatives | (286) | 827 | (152) | 827
Interest expense, net of interest income | 303 | 165 | 653 | 502
Depreciation and amortization of intangible assets | 492 | 402 | 1,391 | 1,174
Income before taxes, excluding unallocated corporate activity | 341 | 446 | 1,007 | 741
Operating Segments | Non-Solar DG |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 33,811 | 28,251 | 99,750 | 74,104
(Gain) loss on derivatives | 2,345 | 481 | 3,065 | 528
Interest expense, net of interest income | 1,835 | 1,029 | 3,651 | 3,140
Depreciation and amortization of intangible assets | 5,670 | 5,013 | 15,469 | 15,720
Income before taxes, excluding unallocated corporate activity | 3,526 | 2,391 | 17,247 | 6,966
Operating Segments | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 28,550 | 29,966 | 79,059 | 70,485
(Gain) loss on derivatives | 0 | 0 | 0 | 0
Interest expense, net of interest income | 71 | 34 | 274 | 67
Depreciation and amortization of intangible assets | 266 | 328 | 827 | 935
Income before taxes, excluding unallocated corporate activity | 1,214 | 3,836 | 4,682 | 6,368
Unallocated corporate activity |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unallocated corporate activity | $ (11,896) | $ (9,341) | $ (33,126) | $ (30,053)

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