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Restructuring Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Jun. 30, 2020
Restructuring costs by type [Abstract] |  |  |  |  |  |
Severance costs and other benefits | $ 4,688 |  | $ 4,222 |  | $ 12,997 |
Facility costs | 209 |  | 244 |  | 3,954 |
Impairment of Intangible Assets, Finite-lived | 0 |  | 0 |  | 1,525 |
Other Restructuring Costs | 148 |  | 259 |  | 259 |
Restructuring costs | 5,045 | $ 0 | 4,725 | $ 0 | 18,735 | $ 14,000
Restructuring costs reserve [Roll Forward] |  |  |  |  |  |
Restructuring reserve balance | 4,101 |  | 4,101 |  | 4,101 | $ 2,403
Restructuring costs incurred |  |  | 3,422 |  |  |
Cash payments |  |  | (1,214) |  |  |
Operating lease and fixed asset impairments due to restructuring |  |  | (510) |  |  |
Minimum [Member] |  |  |  |  |  |
Restructuring costs by type [Abstract] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost Remaining | 1,000 |  | 1,000 |  | 1,000 |
Maximum [Member] |  |  |  |  |  |
Restructuring costs by type [Abstract] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost Remaining | 1,500 |  | 1,500 |  | 1,500 |
Utility and Power Infrastructure [Member] |  |  |  |  |  |
Restructuring costs by type [Abstract] |  |  |  |  |  |
Severance costs and other benefits | 811 |  | 818 |  | 2,158 |
Facility costs | 1 |  | 5 |  | 240 |
Impairment of Intangible Assets, Finite-lived | 0 |  | 0 |  | 1,150 |
Restructuring costs | 812 |  | 823 |  | 3,548 |
Process and Industrial Facilities |  |  |  |  |  |
Restructuring costs by type [Abstract] |  |  |  |  |  |
Severance costs and other benefits | 3,082 |  | 2,590 |  | 8,758 |
Facility costs | 134 |  | 15 |  | 2,770 |
Impairment of Intangible Assets, Finite-lived | 0 |  | 0 |  | 375 |
Other Restructuring Costs | 148 |  | 259 |  | 259 |
Restructuring costs | 3,364 |  | 2,864 |  | 12,162 |
Storage and Terminal Solutions |  |  |  |  |  |
Restructuring costs by type [Abstract] |  |  |  |  |  |
Severance costs and other benefits | 640 |  | 653 |  | 1,000 |
Facility costs | 1 |  | 1 |  | 721 |
Restructuring costs | 641 |  | 654 |  | 1,721 |
Corporate [Member] |  |  |  |  |  |
Restructuring costs by type [Abstract] |  |  |  |  |  |
Severance costs and other benefits | 155 |  | 161 |  | 1,081 |
Facility costs | 73 |  | 223 |  | 223 |
Restructuring costs | $ 228 |  | $ 384 |  | $ 1,304 |

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