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Acquired Intangibles (Tables)
 3 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangibles
March 31, 2020 and December 31, 2019, net of accumulated amortization, are set forth in the following tables:

 
March 31, 2020
 
Assets (1)
 
Liabilities (2)
 
Net Total
Coal supply agreements, net
$
546

 
$
(3,183
)
 
$
(2,637
)
Acquired mine permits, net
115,082

 
—

 
115,082

Total
$
115,628

 
$
(3,183
)
 
$
112,445

 
December 31, 2019
 
Assets (1)
 
Liabilities (2)
 
Net Total
Coal supply agreements, net
$
917

 
$
(6,018
)
 
$
(5,101
)
Acquired mine permits, net
124,228

 
—

 
124,228

Total
$
125,145

 
$
(6,018
)
 
$
119,127

(1) Included within other acquired intangibles, net of accumulated amortization on the Company’s Condensed Consolidated Balance Sheets.
(2) Included within other non-current liabilities on the Company’s Condensed Consolidated Balance Sheets.

During the three months ended March 31, 2020, the Company recorded a long-lived asset impairment which reduced the carrying value of acquired mine permits, net, by $5,818. Refer to Note 8.