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Debt and Interest Expense - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 01, 2019
Feb. 28, 2019
Dec. 19, 2018
Feb. 16, 2018
Jun. 30, 2017
Debt Instrument [Line Items]                  
APCWH Note Payable, maximum borrowing [1]   $ 0 $ 427,493,000            
Cash paid to settle interest-rate swaps   107,685,000 0 $ 0          
Accrued liability on interest-rate swaps [2]   149,793,000 129,148,000            
Gain (loss) on interest-rate swaps   (125,334,000) (7,972,000) 0          
WES [Member] | Revolving Credit Facility [Member] | WGP RCF [Member]                  
Debt Instrument [Line Items]                  
Facility, maximum borrowing capacity               $ 35,000,000.0  
Facility, repayment of borrowings $ 28,000,000.0 28,000,000              
WES Operating [Member]                  
Debt Instrument [Line Items]                  
APCWH Note Payable, maximum borrowing [3]   0 427,493,000            
Cash paid to settle interest-rate swaps   107,685,000 0 0          
Accrued liability on interest-rate swaps [4]   149,639,000 127,874,000            
Gain (loss) on interest-rate swaps   (125,334,000) (7,972,000) $ 0          
WES Operating [Member] | Interest-Rate Swap [Member]                  
Debt Instrument [Line Items]                  
Cash paid to settle interest-rate swaps   107,700,000              
Gain (loss) on interest-rate swaps   125,300,000 8,000,000.0            
WES Operating [Member] | Not Designated as Hedging Instrument [Member] | Interest-Rate Swap [Member]                  
Debt Instrument [Line Items]                  
Interest-rate swap, notional amount $ 375,000,000.0 1,125,000,000.0 750,000,000.0            
Accrued liability on interest-rate swaps   25,600,000              
WES Operating [Member] | Not Designated as Hedging Instrument [Member] | Level-2 Inputs [Member] | Valuation, Market Approach [Member] | Interest-Rate Swap [Member] | Accrued Liabilities [Member]                  
Debt Instrument [Line Items]                  
Interest-rate swap, liability fair value     $ 8,000,000.0            
WES Operating [Member] | APCWH Note Payable [Member]                  
Debt Instrument [Line Items]                  
APCWH Note Payable, interest rate     3.04%            
WES Operating [Member] | APCWH Note Payable [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
APCWH Note Payable, maximum borrowing                 $ 500,000,000.0
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member]                  
Debt Instrument [Line Items]                  
Facility, maximum borrowing capacity           $ 2,000,000,000.0      
Facility, repayment of borrowings   $ 1,000,000,000 $ 690,000,000            
Facility, expandable maximum borrowing capacity           $ 2,500,000,000      
Facility, fee rate   0.20% 0.20%            
Facility, outstanding borrowings   $ 380,000,000.0              
Facility, available borrowing capacity   1,600,000,000              
Facility, outstanding letters of credit   $ 4,600,000              
Facility, interest rate at period end   3.04% 3.74%            
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Facility, fee rate   0.125%              
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Facility, fee rate   0.25%              
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   1.00%              
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   1.50%              
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member] | London Interbank Offered Rate (LIBOR) [Member] | Alternate Base Rate [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   1.00%              
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member] | Percentage Above Federal Funds Effective Rate [Member] | Alternate Base Rate [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   0.50%              
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member] | Base Rate [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   0.00%              
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member] | Base Rate [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   0.50%              
WES Operating [Member] | Revolving Credit Facility [Member] | RCF [Member] | Non-Extending Lender [Member]                  
Debt Instrument [Line Items]                  
Facility, borrowing capacity for non-extending lender   $ 100,000,000.0              
WES Operating [Member] | Revolving Credit Facility [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Facility, maximum borrowing capacity         $ 3,000,000,000.0   $ 2,000,000,000.0    
Facility, outstanding borrowings   $ 3,000,000,000.0              
Facility, interest rate at period end   3.10%              
Facility, incremental capacity with provision carve out         $ 1,000,000,000.0        
WES Operating [Member] | Revolving Credit Facility [Member] | Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   1.00%              
WES Operating [Member] | Revolving Credit Facility [Member] | Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   1.625%              
WES Operating [Member] | Revolving Credit Facility [Member] | Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Alternate Base Rate [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   1.00%              
WES Operating [Member] | Revolving Credit Facility [Member] | Term Loan Facility [Member] | Percentage Above Federal Funds Effective Rate [Member] | Alternate Base Rate [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   0.50%              
WES Operating [Member] | Revolving Credit Facility [Member] | Term Loan Facility [Member] | Base Rate [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   0.00%              
WES Operating [Member] | Revolving Credit Facility [Member] | Term Loan Facility [Member] | Base Rate [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Facility, applicable margin added   0.625%              
[1]
See Note 1 and Note 6.
[2]
Accrued liabilities includes affiliate amounts of $3.1 million and $2.2 million as of December 31, 2019 and 2018, respectively.
[3]
See Note 1 and Note 6.
[4]
Accrued liabilities includes affiliate amounts of $3.1 million and $2.2 million as of December 31, 2019 and 2018, respectively.