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REVENUES - Remaining Performance Obligation (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 2,959,080
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 746,773
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 552,741
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 332,602
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 176,181
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 267,368
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected timing of satisfaction 5 years