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RESTRUCTURING ACTIVITIES - Restructuring Activities - Restruciting Expenses and Related Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 7,019 | $ 11,419
ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 5,419 | 9,047
Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,474 | 2,246
Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 126 | 126
Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 4,490 | 6,830
Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 3,016 | 4,584
Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,474 | 2,246
Total cost of sales | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 2,529 | 4,589
Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 2,403 | 4,463
Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Selling, General and Administrative Expenses | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 126 | 126
Severance | Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 2,118 | 2,541
Severance | Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,603 | 2,026
Severance | Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 515 | 515
Severance | Total cost of sales | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Severance | Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,533 | 3,511
Severance | Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,533 | 3,511
Severance | Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Severance | Selling, General and Administrative Expenses | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Other cash restructuring expenses | Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,111 | 1,883
Other cash restructuring expenses | Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 152 | 152
Other cash restructuring expenses | Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 959 | 1,731
Other cash restructuring expenses | Total cost of sales | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Other cash restructuring expenses | Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 611 | 693
Other cash restructuring expenses | Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 485 | 567
Other cash restructuring expenses | Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Other cash restructuring expenses | Selling, General and Administrative Expenses | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 126 | 126
Asset impairments/net loss on disposals | Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,261 | 2,406
Asset impairments/net loss on disposals | Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,261 | 2,406
Asset impairments/net loss on disposals | Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Asset impairments/net loss on disposals | Total cost of sales | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Asset impairments/net loss on disposals | Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 385 | 385
Asset impairments/net loss on disposals | Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 385 | 385
Asset impairments/net loss on disposals | Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Asset impairments/net loss on disposals | Selling, General and Administrative Expenses | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 0 | $ 0

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