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Investments (Tables)
 12 Months Ended
Dec. 31, 2019
Investments [Abstract]  
Schedule of investments
Years Ending December 31, 2019 and 2018 (in thousands)
 
WMES
 
CASC
Willis
 
Total
Investment in joint ventures as of December 31, 2017
 
$
36,014

 
$
14,627

 
$
50,641

Earnings (loss) from joint ventures
 
3,899

 
(99
)
 
3,800

Distribution
 
(5,730
)
 
—

 
(5,730
)
Foreign currency translation adjustment
 
—

 
(770
)
 
(770
)
Investment in joint ventures as of December 31, 2018
 
34,183

 
13,758

 
47,941

Earnings from joint ventures
 
8,312

 
266

 
8,578

Contribution
 
5,713

 
—

 
5,713

Distribution
 
(3,300
)
 
—

 
(3,300
)
Foreign currency translation adjustment
 
—

 
(222
)
 
(222
)
Other comprehensive loss from joint ventures
 
(774
)
 
—

 
(774
)
Investment in joint ventures as of December 31, 2019
 
$
44,134

 
$
13,802

 
$
57,936
Summarized financial information
Unaudited summarized financial information for 100% of WMES is presented in the following table:
 
Years Ended December 31,
2019
 
2018
(in thousands)
Revenue
$
55,770

 
$
38,465

Expenses
41,253

 
30,934

WMES net income
$
14,517

 
$
7,531

 
As of December 31,
2019
 
2018
(in thousands)
Total assets
$
322,606

 
$
274,744

Total liabilities
227,052

 
198,534

Total WMES net equity
$
95,554

 
$
76,210