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Fair Value of Financial Instruments (The Waha JVs) (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
pipeline
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investments, equity in earnings (losses) $ 6,260 $ 5,585  
Unrealized (losses) gains on equity investee activity, net of tax (5,462) 7,716  
Equity Investee [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investments, net investment $ 188,000   $ 197,000
Waha JVs [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Number of pipelines in operation | pipeline 2    
Equity method investments, equity contributions $ 800 14,800  
Equity method investments, equity in earnings (losses) 6,300 5,600  
Equity method investments, cumulative undistributed earnings 32,300    
Equity method investments, distributions of earnings received, operating cash flows 3,900 5,700  
Unrealized (losses) gains on equity investee activity, before tax (7,200) 10,100  
Unrealized (losses) gains on equity investee activity, net of tax (5,500) $ 7,700  
Waha JVs [Member] | Equity Investee [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investments, net investment $ 167,000   $ 168,000