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Acquired Intangibles (Tables)
6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangibles The balances and respective balance sheet classifications of such assets and liabilities as of June 30, 2020 and December 31, 2019, net of accumulated amortization, are set forth in the following tables:
June 30, 2020
Assets (1)
Liabilities (2)
Net Total
Coal supply agreements, net$330  $(1,745) $(1,415) 
Acquired mine permits, net103,109  —  103,109  
Total$103,439  $(1,745) $101,694  
December 31, 2019
Assets (1)
Liabilities (2)
Net Total
Coal supply agreements, net$917  $(6,018) $(5,101) 
Acquired mine permits, net124,228  —  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.
The following table details the amortization of mine permits acquired as a result of the Merger and the amortization of above-market and below-market coal supply agreements:
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Amortization of mine permits (1)
$3,320  $5,664  $6,648  $11,605  
Amortization of above-market coal supply agreements$215  $122  $587  $879  
Amortization of below-market coal supply agreements(1,439) (6,129) (4,274) (19,510) 
Net income (1)
$(1,224) $(6,007) $(3,687) $(18,631) 

(1) Included within amortization of acquired intangibles, net in the Condensed Consolidated Statements of Operations.