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Asset Dispositions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Oct. 31, 2018
Jul. 27, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Gain on disposal   $ 0 $ 174,984    
NexTraq | Held-for-sale          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Consideration         $ 316,000
Gain on disposal $ 175,000        
Tax effect of gain from disposal $ 65,800        
Subsequent Event | Chevron | Held-for-sale          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Expected consideration       $ 160,000