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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