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Equity Investments
 9 Months Ended
Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]  
Equity Investments
7.  EQUITY INVESTMENTS

The following table presents the activity of WES’s equity investments for the nine months ended September 30, 2017:
 
Equity Investments
thousands
Fort
Union
 
White
Cliffs
 
Rendezvous
 
Mont
Belvieu JV
 
TEG
 
TEP
 
FRP
 
Total
Balance at December 31, 2016
$
12,833

 
$
47,319

 
$
46,739

 
$
112,805

 
$
15,846

 
$
189,194

 
$
169,472

 
$
594,208

Investment earnings (loss), net of amortization
2,964

 
9,984

 
840

 
20,430

 
2,325

 
13,332

 
12,833

 
62,708

Impairment expense (1)
(3,110
)
 
—


—

 
—

 
—

 
—

 
—

 
(3,110
)
Contributions
—

 
277

 
—

 
—

 
—

 
107

 
—

 
384

Distributions
(3,359
)
 
(9,548
)
 
(2,296
)
 
(20,459
)
 
(2,167
)
 
(13,520
)
 
(12,964
)
 
(64,313
)
Distributions in excess of cumulative earnings (2)
(1,662
)
 
(2,325
)
 
(1,616
)
 
(2,316
)
 
—

 
(6,091
)
 
(2,245
)
 
(16,255
)
Balance at September 30, 2017
$
7,666

 
$
45,707

 
$
43,667

 
$
110,460

 
$
16,004

 
$
183,022

 
$
167,096

 
$
573,622

(1) 
Recorded in Impairments in the consolidated statements of operations.
(2) 
Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

The investment balance in Fort Union at September 30, 2017, is $3.1 million less than WES’s underlying equity in Fort Union’s net assets due to an impairment loss recognized by WES in the second quarter of 2017 for its investment in Fort Union. This investment was impaired to its estimated fair value of $8.5 million, using the income approach and Level 3 fair value inputs.