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Note 14 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash and cash equivalents $ 32,995   $ 27,389      
Other current assets 145,931   136,761      
Properties, plants, equipment and mineral interests, net 2,455,511   2,520,004      
Intercompany receivable (payable) 0   0      
Investments in subsidiaries 0   0      
Other non-current assets 38,741   19,790      
Total assets 2,673,178   2,703,944      
Current liabilities 145,843   136,194      
Long-term debt 604,653   540,670      
Accrued reclamation and closure costs 103,821   104,979      
Non-current deferred tax liability 143,442   173,537      
Other non-current liabilities 58,775   57,601      
Shareholders' equity 1,616,644 $ 1,639,228 1,690,963 $ 1,722,069 $ 1,478,695 $ 1,461,277
Total liabilities and shareholders' equity 2,673,178   2,703,944      
Reportable Legal Entities [Member] | Parent Company [Member]            
Cash and cash equivalents 18,983   6,266      
Other current assets 7,031   6,388      
Properties, plants, equipment and mineral interests, net 1,913   1,913      
Intercompany receivable (payable) 143,248   171,908      
Investments in subsidiaries 1,499,318   1,577,869      
Other non-current assets 284,380   276,641      
Total assets 1,954,873   2,040,985      
Current liabilities (298,754)   (233,824)      
Long-term debt 584,618   532,799      
Accrued reclamation and closure costs 0   0      
Non-current deferred tax liability 0   0      
Other non-current liabilities 52,365   51,047      
Shareholders' equity 1,616,644   1,690,963      
Total liabilities and shareholders' equity 1,954,873   2,040,985      
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]            
Cash and cash equivalents 9,608   17,233      
Other current assets 113,542   105,900      
Properties, plants, equipment and mineral interests, net 2,438,137   2,503,467      
Intercompany receivable (payable) (709,012)   (546,374)      
Investments in subsidiaries 0   0      
Other non-current assets 25,380   10,906      
Total assets 1,877,655   2,091,132      
Current liabilities 165,564   157,640      
Long-term debt 19,159   143,858      
Accrued reclamation and closure costs 95,674   100,445      
Non-current deferred tax liability 146,069   163,328      
Other non-current liabilities 5,393   5,641      
Shareholders' equity 1,445,796   1,520,220      
Total liabilities and shareholders' equity 1,877,655   2,091,132      
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]            
Cash and cash equivalents 4,404   3,890      
Other current assets 25,430   24,542      
Properties, plants, equipment and mineral interests, net 15,461   14,624      
Intercompany receivable (payable) 149,616   152,031      
Investments in subsidiaries 0   0      
Other non-current assets (120,645)   (124,845)      
Total assets 74,266   70,242      
Current liabilities 10,704   7,145      
Long-term debt 876   1      
Accrued reclamation and closure costs 8,147   4,534      
Non-current deferred tax liability 0   0      
Other non-current liabilities 1,017   913      
Shareholders' equity 53,522   57,649      
Total liabilities and shareholders' equity 74,266   70,242      
Consolidation, Eliminations [Member]            
Cash and cash equivalents 0   0      
Other current assets (72)   (69)      
Properties, plants, equipment and mineral interests, net 0   0      
Intercompany receivable (payable) 416,148   222,435      
Investments in subsidiaries (1,499,318)   (1,577,869)      
Other non-current assets (150,374)   (142,912)      
Total assets (1,233,616)   (1,498,415)      
Long-term debt 0   (135,988)      
Accrued reclamation and closure costs 0   0      
Non-current deferred tax liability (2,627)          
Other non-current liabilities 0   0      
Shareholders' equity (1,499,318)   (1,577,869)      
Total liabilities and shareholders' equity (1,233,616)   (1,498,415)      
Segment Reconciling Items [Member]            
Current liabilities $ 268,329   205,233      
Non-current deferred tax liability     $ 10,209