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Debt and Interest Expense (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Instruments [Abstract]  
Debt Outstanding and Debt Activity Tables
The following table presents WES and WGP’s outstanding debt as of June 30, 2017, and December 31, 2016:
 
 
June 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

 
495,268

 
537,476

 
500,000

 
494,734

 
536,252

2022 Notes
 
670,000

 
668,740

 
686,001

 
670,000

 
668,634

 
681,723

2018 Notes
 
350,000

 
349,434

 
351,057

 
350,000

 
349,188

 
351,531

2044 Notes
 
600,000

 
593,179

 
618,294

 
600,000

 
593,132

 
615,753

2025 Notes
 
500,000

 
491,423

 
497,615

 
500,000

 
490,971

 
492,499

2026 Notes
 
500,000

 
495,021

 
517,289

 
500,000

 
494,802

 
518,441

WES RCF
 
160,000

 
160,000

 
160,000

 
—

 
—

 
—

Total long-term debt
 
$
3,308,000

 
$
3,281,065

 
$
3,395,732

 
$
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 six months ended June 30, 2017:
thousands
 
Carrying Value
Balance at December 31, 2016
 
$
3,119,461

WES RCF borrowings
 
160,000

Other
 
1,604

Balance at June 30, 2017
 
$
3,281,065
Interest Expense Table
The following table summarizes the amounts included in interest expense:
 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
thousands
 
2017
 
2016
 
2017
 
2016
Third parties
 
 
 
 
 
 
 
 
Long-term debt
 
$
(35,375
)
 
$
(28,472
)
 
$
(70,189
)
 
$
(56,328
)
Amortization of debt issuance costs and commitment fees
 
(1,982
)
 
(1,900
)
 
(3,946
)
 
(3,495
)
Capitalized interest
 
1,060

 
1,482

 
1,876

 
3,331

Total interest expense – third parties
 
(36,297
)
 
(28,890
)
 
(72,259
)
 
(56,492
)
Affiliates
 
 
 
 
 
 
 
 
Deferred purchase price obligation – Anadarko (1)
 
—

 
15,461

 
(71
)
 
10,924

Total interest expense – affiliates
 
—

 
15,461

 
(71
)
 
10,924

Interest expense
 
$
(36,297
)
 
$
(13,429
)
 
$
(72,330
)
 
$
(45,568
)
(1) 
See Note 2 for a discussion of the Deferred purchase price obligation - Anadarko.