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Business Segments
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Business Segments
Business Segments

NACCO is a holding company that operates primarily in the mining industry. The Company’s wholly owned subsidiary, NACoal, is the reportable operating segment. See Note 1 for a discussion of the Company's industries and product lines. NACCO's non-operating segment, NACCO and Other, includes the accounts of the parent company and Bellaire.
Financial information for each of NACCO's reportable segments is presented in the following table. All operations reside in the U.S. The accounting policies of the reportable segments are described in Note 2.
The majority of NACoal's revenues are generated from its consolidated mining operations and value-added mining services. MLMC's customer, KMRC RH, LLC until April 30, 2016 and Choctaw Generation Limited Partnership, LLLP subsequent to April 30, 2016, accounted for approximately 60%, 69% and 57% of NACoal's revenues for the years ended December 31, 2017, 2016 and 2015, respectively. NAM's largest customer, Cemex Construction Materials of Florida, LLC, accounted for approximately 18% and 16% of NACoal's revenues for the year ended December 31, 2017 and 2016, respectively. Centennial's largest customer was the Alabama Coal Cooperative and accounted for approximately 16% of NACoal's revenues for the year ended December 31, 2015. The loss of or significant reduction in sales to any key customer could result in significant decreases in NACoal's revenue and profitability and an inability to sustain or grow its business.
The management fees charged to NACoal represent an allocation of corporate overhead of the parent company. The Company believes the allocation method is reasonable. Management fees included in NACoal's Selling, general and administrative expenses were $5.8 million, $7.4 million and $5.3 million for 2017, 2016 and 2015, respectively.
In addition, prior to the spin-off of HBBHC, NACCO received management fees from HBBHC of $3.0 million, $4.1 million and $3.9 million for the years ended December 31, 2017, 2016 and 2015, respectively. In connection with the spin-off of HBBHC, the Company and HBBHC entered into a TSA. See Note 3 for further discussion of the spin-off and TSA.
 
2017
 
2016
 
2015
 
 
 
 
 
 
Revenues from external customers
$
104,778

 
$
111,081

 
$
147,998

Gross profit (loss)
 
 
 
 
 
NACoal
$
17,198

 
$
12,341

 
$
(10,816
)
NACCO and Other
(279
)
 
(259
)
 
(416
)
Total
$
16,919

 
$
12,082

 
$
(11,232
)
Earnings of unconsolidated mines
$
61,361

 
$
55,238

 
$
48,432

Selling, general and administrative expenses, including Amortization of intangible assets
 
 
 
 
 
NACoal
$
42,516

 
$
44,347

 
$
38,867

NACCO and Other
7,098

 
7,019

 
3,844

Total
$
49,614

 
$
51,366

 
$
42,711

Operating profit (loss)
 
 
 
 
 
NACoal
$
39,677

 
$
5,619

 
$
521

NACCO and Other
(6,863
)
 
(7,278
)
 
(4,248
)
Total
$
32,814

 
$
(1,659
)
 
$
(3,727
)
 
 
 
 
 
 
 
2017
 
2016
 
2015
Total assets
 
 
 
 
 
NACoal
$
277,538

 
$
287,011

 
$
303,138

NACCO and Other
135,434

 
109,022

 
64,069

Discontinued Operations
—

 
311,171

 
310,051

Eliminations
(23,420
)
 
(39,183
)
 
(21,850
)
Total
$
389,552

 
$
668,021

 
$
655,408

Depreciation, depletion and amortization
 
 
 
 
 
NACoal
$
12,444

 
$
12,682

 
$
17,067

NACCO and Other
323

 
368

 
305

Total
$
12,767

 
$
13,050

 
$
17,372

Capital expenditures
 
 
 
 
 
NACoal
$
15,692

 
$
10,109

 
$
4,116

NACCO and Other
12

 
56

 
328

Total
$
15,704

 
$
10,165

 
$
4,444