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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table disaggregates revenue by major sources:
 
THREE MONTHS ENDED
 
MARCH 31
Major Goods/Service Lines
2020
 
2019
Coal Mining
$
20,928

 
$
16,750

NAMining
11,624

 
10,775

Minerals Management
5,241

 
12,686

Unallocated Items
26

 
543

Eliminations
(175
)
 
(657
)
Total revenues
$
37,644

 
$
40,097

 
 
 
 
Timing of Revenue Recognition
 
 
 
Goods transferred at a point in time
$
20,284

 
$
16,086

Services transferred over time
17,360

 
24,011

Total revenues
$
37,644

 
$
40,097
Contract Balances
The opening and closing balances of the Company’s current and long-term contract liabilities and receivables are as follows:
 
Contract balances
 
Trade accounts receivable, net
 
Contract liability (current)
 
Contract liability (long-term)
Balance, January 1, 2020
$
15,444

 
$
944

 
$
2,153

Balance, March 31, 2020
21,122

 
942

 
1,918

Increase (decrease)
$
5,678

 
$
(2
)
 
$
(235
)