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Summary of Quarterly Financial Data (Unaudited) (Notes)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Consolidated Quarterly Financial Information
SUMMARY OF QUARTERLY FINANCIAL DATA (UNAUDITED)
The following table sets forth a summary of the unaudited quarterly results of operations for the years ended December 31, 2020 and 2019 (in thousands, except per share data):
Q1Q2Q3Q4
2020    
Revenues$173,167 $154,249 $229,728 $228,317 
Costs applicable to sales118,917 90,015 112,772 118,631 
Amortization36,162 27,876 32,216 35,133 
Gross Profit18,088 36,358 84,740 74,553 
Exploration6,386 11,855 12,818 11,584 
Other operating expenses (General and administrative, Pre-development, reclamation, and other, and Impairment of long-lived assets)15,475 27,291 22,788 23,822 
Income (loss) from continuing operations(11,900)(1,209)26,856 11,880 
Income (loss) from discontinued operations— — — — 
Net income (loss)(11,900)(1,209)26,856 11,880 
Cash provided by (used in) operating activities(7,991)9,947 79,464 67,289 
Capital expenditures22,208 16,682 22,996 37,393 
Basic income (loss) per share:
Net income (loss) from continuing operations$(0.05)$(0.01)$0.11 $0.05 
Net income (loss) from discontinued operations0.00 0.00 0.00 0.00 
Basic$(0.05)$(0.01)$0.11 $0.05 
Diluted income (loss) per share:
Net income (loss) from continuing operations$(0.05)$(0.01)$0.11 $0.05 
Net income (loss) from discontinued operations0.00 0.00 0.00 0.00 
Diluted$(0.05)$(0.01)$0.11 $0.05 

Q1Q2Q3Q4
2019    
Revenues$154,870 $162,123 $199,469 $195,040 
Costs applicable to sales$131,650 $131,948 $140,952 146,631 
Amortization$41,876 $43,204 $45,678 48,118 
Gross Profit$(18,656)$(13,029)$12,839 291 
Exploration$3,714 $5,719 $5,893 7,201 
Other operating expenses (General and administrative, Pre-development, reclamation, and other, and Impairment of long-lived assets)$13,908 $12,084 $14,486 263,250 
Income (loss) from continuing operations$(24,894)$(36,764)$(14,277)(270,961)
Income (loss) from discontinued operations$5,693 $— $— — 
Net income (loss)$(19,201)$(36,764)$(14,277)(270,961)
Cash provided by (used in) operating activities$(15,846)$26,435 $41,996 39,295 
Capital expenditures$27,438 $20,749 $30,678 20,907 
Basic income (loss) per share:
Net income (loss) from continuing operations$(0.12)$(0.18)$(0.06)$(1.13)
Net income (loss) from discontinued operations0.03 0.00 0.00 0.00 
Basic$(0.09)$(0.18)$(0.06)$(1.13)
Diluted income (loss) per share:
Net income (loss) from continuing operations$(0.12)$(0.18)$(0.06)$(1.13)
Net income (loss) from discontinued operations0.03 0.00 0.00 0.00 
Diluted$(0.09)$(0.18)$(0.06)$(1.13)