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FAIR VALUE - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Notes receivable, fair value |  |  | $ 4,900 |  | $ 1,800 |  |
PPS Tech and PPS Northeast |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  | 1,000 |  | 1,000 |  |
Warrants on Class A Common Units |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value of liability | $ 12,773 | $ 12,773 | $ 0 | $ 0 | $ 0 | $ 12,182 | $ 8,701
Increase (decrease) in fair value of liability | $ 3,500 | $ 3,500 |  |  |  |  |
GS 1.8% Warrants | Common Class A |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrant, percentage of outstanding stock available for purchase |  |  |  |  |  | 1.80% |
GS 2.2% Warrants | Common Class A |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrant, percentage of outstanding stock available for purchase | 2.20% | 2.20% |  |  |  | 2.20% |
Warrant, term |  |  |  |  |  | 7 years |
Warrant exercise price (USD per share) |  |  |  |  |  | $ 0 |

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