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Debt and Interest Expense (Tables)
 9 Months Ended
Sep. 30, 2017
Debt Instruments [Abstract]  
Debt Outstanding and Debt Activity Tables
The following table presents WES and WGP’s outstanding debt as of September 30, 2017, and December 31, 2016:
 
 
September 30, 2017
 
December 31, 2016
thousands
 
Principal
 
Carrying
Value
 
Fair
Value (1)
 
Principal
 
Carrying
Value
 
Fair
Value (1)
WGP RCF
 
$
28,000

 
$
28,000

 
$
28,000

 
$
28,000

 
$
28,000

 
$
28,000

2021 Notes
 
500,000

 
495,541

 
536,712

 
500,000

 
494,734

 
536,252

2022 Notes
 
670,000

 
668,795

 
693,789

 
670,000

 
668,634

 
681,723

2018 Notes
 
350,000

 
349,558

 
351,770

 
350,000

 
349,188

 
351,531

2044 Notes
 
600,000

 
593,206

 
634,283

 
600,000

 
593,132

 
615,753

2025 Notes
 
500,000

 
491,653

 
503,322

 
500,000

 
490,971

 
492,499

2026 Notes
 
500,000

 
495,133

 
525,069

 
500,000

 
494,802

 
518,441

WES RCF
 
250,000

 
250,000

 
250,000

 
—

 
—

 
—

Total long-term debt
 
$
3,398,000

 
$
3,371,886

 
$
3,522,945

 
$
3,148,000

 
$
3,119,461

 
$
3,224,199

                                                                                                                                                                                    
(1) 
Fair value is measured using the market approach and Level 2 inputs.

Debt activity. The following table presents WES and WGP’s debt activity for the nine months ended September 30, 2017:
thousands
 
Carrying Value
Balance at December 31, 2016
 
$
3,119,461

WES RCF borrowings
 
250,000

Other
 
2,425

Balance at September 30, 2017
 
$
3,371,886
Interest Expense Table
The following table summarizes the amounts included in interest expense:
 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
thousands
 
2017
 
2016
 
2017
 
2016
Third parties
 
 
 
 
 
 
 
 
Long-term debt
 
$
(36,223
)
 
$
(31,795
)
 
$
(106,412
)
 
$
(88,123
)
Amortization of debt issuance costs and commitment fees
 
(2,009
)
 
(2,022
)
 
(5,955
)
 
(5,517
)
Capitalized interest
 
2,115

 
1,343

 
3,991

 
4,674

Total interest expense – third parties
 
(36,117
)
 
(32,474
)
 
(108,376
)
 
(88,966
)
Affiliates
 
 
 
 
 
 
 
 
Deferred purchase price obligation – Anadarko (1)
 
—

 
1,173

 
(71
)
 
12,097

Total interest expense – affiliates
 
—

 
1,173

 
(71
)
 
12,097

Interest expense
 
$
(36,117
)
 
$
(31,301
)
 
$
(108,447
)
 
$
(76,869
)
(1) 
See Note 2 for a discussion of the Deferred purchase price obligation - Anadarko.