XML 65 R55.htm IDEA: XBRL DOCUMENT v3.4.0.3
Debt and Interest Expense - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 14, 2016
Apr. 30, 2016
Mar. 31, 2016
Mar. 31, 2015
Nov. 01, 2012
Working Capital Facility [Member] | Affiliates [Member]          
Debt Instrument [Line Items]          
Facility, maximum borrowing capacity         $ 30,000,000
Facility, interest rate at period end     1.94% 1.68%  
Facility, outstanding borrowings     $ 0    
Facility, available borrowing capacity     $ 30,000,000    
Facility, expiration date     Nov. 01, 2017    
Working Capital Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Affiliates [Member]          
Debt Instrument [Line Items]          
Applicable margin added     1.50%    
WGP RCF [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Facility, maximum borrowing capacity     $ 250,000,000    
Facility, expandable maximum borrowing capacity     500,000,000    
Borrowings $ 25,000,000   $ 28,000,000    
Facility, interest rate at period end     2.69%    
Facility, fee rate     0.30%    
Facility, outstanding borrowings     $ 28,000,000    
Facility, available borrowing capacity     $ 222,000,000    
Facility, expiration date     Mar. 14, 2019    
WGP RCF [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Debt instrument, variable rate floor     0.00%    
WGP RCF [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Alternate Base Rate [Member]          
Debt Instrument [Line Items]          
Applicable margin added     1.00%    
WGP RCF [Member] | Revolving Credit Facility [Member] | Percentage Above Federal Funds Effective Rate [Member] | Alternate Base Rate [Member]          
Debt Instrument [Line Items]          
Applicable margin added     0.50%    
WGP RCF [Member] | Revolving Credit Facility [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Facility, fee rate     0.30%    
WGP RCF [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Applicable margin added     2.00%    
WGP RCF [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Applicable margin added     1.00%    
WGP RCF [Member] | Revolving Credit Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Facility, fee rate     0.50%    
WGP RCF [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Applicable margin added     2.75%    
WGP RCF [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Applicable margin added     1.75%    
Western Gas Partners, LP [Member]          
Debt Instrument [Line Items]          
Units issued     323,584    
Western Gas Partners, LP [Member] | Common Units [Member] | Springfield Pipeline LLC [Member]          
Debt Instrument [Line Items]          
Units issued 2,089,602 [1]   835,841    
Western Gas Partners, LP [Member] | Series A Preferred Units [Member]          
Debt Instrument [Line Items]          
Proceeds from the issuance of WES units $ 440,000,000   $ 440,000,000 $ 0 [2]  
Western Gas Partners, LP [Member] | Series A Preferred Units [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Proceeds from the issuance of WES units   $ 247,500,000      
Western Gas Partners, LP [Member] | Series A Preferred Units [Member] | Springfield Pipeline LLC [Member]          
Debt Instrument [Line Items]          
Units issued [1] 14,030,611        
Western Gas Partners, LP [Member] | WES RCF [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Borrowings     $ 330,000,000    
Facility, interest rate at period end     1.74% 1.48%  
Facility, fee rate     0.20% 0.20%  
Facility, outstanding borrowings     $ 630,000,000    
Outstanding letters of credit     4,900,000    
Facility, available borrowing capacity     $ 565,100,000    
Facility, expiration date     Feb. 26, 2019    
Western Gas Partners, LP [Member] | WES RCF [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Repayment   $ 250,000,000      
Western Gas Partners, LP [Member] | WES RCF [Member] | Revolving Credit Facility [Member] | Springfield Pipeline LLC [Member]          
Debt Instrument [Line Items]          
Borrowings [1] $ 247,500,000        
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member]          
Debt Instrument [Line Items]          
Fixed interest rate     5.375%    
Debt instrument, maturity date     Jun. 01, 2021    
Western Gas Partners, LP [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member]          
Debt Instrument [Line Items]          
Fixed interest rate     4.00%    
Debt instrument, maturity date     Jul. 01, 2022    
Western Gas Partners, LP [Member] | Senior Notes [Member] | 2.600% Senior Notes due 2018 [Member]          
Debt Instrument [Line Items]          
Fixed interest rate     2.60%    
Debt instrument, maturity date     Aug. 15, 2018    
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member]          
Debt Instrument [Line Items]          
Fixed interest rate     5.45%    
Debt instrument, maturity date     Apr. 01, 2044    
Western Gas Partners, LP [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member]          
Debt Instrument [Line Items]          
Fixed interest rate     3.95%    
Debt instrument, maturity date     Jun. 01, 2025    
[1] WES acquired Springfield Pipeline LLC (“Springfield”) from Anadarko for $750.0 million, consisting of $712.5 million in cash and the issuance of 1,253,761 of WES common units. Springfield owns a 50.1% interest in an oil gathering system and a gas gathering system, such interest being referred to in this report as the “Springfield system.” The Springfield oil and gas gathering systems are located in Dimmit, La Salle, Maverick and Webb Counties in South Texas. WES financed the cash portion of the acquisition through: (i) borrowings of $247.5 million on the WES RCF, (ii) the issuance of 835,841 of WES common units to WGP and (iii) the issuance of WES Series A Preferred units noted above to private investors (the “initial issuance”). See Note 4 for further information regarding the WES Series A Preferred units, including the full exercise of an option granted in connection with the initial issuance. WGP financed the purchase of the WES common units by borrowing $25.0 million on the WGP RCF. See Note 9.
[2] Financial information has been recast to include the financial position and results attributable to the Springfield system. See Note 1 and Note 2.