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Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Revenues | $ 212,413 | $ 150,112
Interest income | 90 | 133
Interest expense | 3,459 | 2,808
Depreciation and amortization of intangible assets | 9,834 | 8,838
Income (loss) before taxes, excluding unallocated corporate activity | 14,477 | 11,136
U.S. Regions |  |
Segment Reporting Information [Line Items] |  |
Revenues | 84,727 | 55,597
U.S. Federal |  |
Segment Reporting Information [Line Items] |  |
Revenues | 68,745 | 43,057
Canada |  |
Segment Reporting Information [Line Items] |  |
Revenues | 11,392 | 7,148
Non-Solar DG |  |
Segment Reporting Information [Line Items] |  |
Revenues | 22,724 | 21,230
All Other |  |
Segment Reporting Information [Line Items] |  |
Revenues | 24,825 | 23,080
Operating Segments | U.S. Regions |  |
Segment Reporting Information [Line Items] |  |
Revenues | 84,727 | 55,597
Interest income | 36 | 63
Interest expense | 1,481 | 857
Depreciation and amortization of intangible assets | 2,763 | 2,182
Income (loss) before taxes, excluding unallocated corporate activity | 3,723 | (278)
Operating Segments | U.S. Federal |  |
Segment Reporting Information [Line Items] |  |
Revenues | 68,745 | 43,057
Interest income | 40 | 49
Interest expense | 746 | 210
Depreciation and amortization of intangible assets | 1,017 | 817
Income (loss) before taxes, excluding unallocated corporate activity | 7,094 | 5,621
Operating Segments | Canada |  |
Segment Reporting Information [Line Items] |  |
Revenues | 11,392 | 7,148
Interest income | 0 | 0
Interest expense | 172 | 164
Depreciation and amortization of intangible assets | 391 | 275
Income (loss) before taxes, excluding unallocated corporate activity | (221) | (289)
Operating Segments | Non-Solar DG |  |
Segment Reporting Information [Line Items] |  |
Revenues | 22,724 | 21,230
Interest income | 14 | 21
Interest expense | 1,045 | 1,577
Depreciation and amortization of intangible assets | 5,287 | 5,216
Income (loss) before taxes, excluding unallocated corporate activity | 1,669 | 1,381
Operating Segments | All Other |  |
Segment Reporting Information [Line Items] |  |
Revenues | 24,825 | 23,080
Interest income | 0 | 0
Interest expense | 15 | 0
Depreciation and amortization of intangible assets | 376 | 348
Income (loss) before taxes, excluding unallocated corporate activity | 2,212 | 4,701
Unallocated corporate activity |  |
Segment Reporting Information [Line Items] |  |
Unallocated corporate activity | $ (10,346) | $ (8,008)

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