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Supplemental Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Assets        
Cash and cash equivalents $ 269,814 $ 450,781 $ 439,655 $ 734,231
Short term investments 203,417 200,192    
Restricted cash 102,236 97,542    
Receivables 144,464 135,767    
Inventories 172,698 196,720    
Other 51,569 57,923    
Total current assets 944,198 1,138,925    
Property, plant and equipment, net 3,493,553 3,619,029    
Investment in subsidiaries 0 0    
Intercompany receivables 0 0    
Note receivable from Arch Western 0 0    
Other 247,474 283,927    
Total other assets 247,474 283,927    
Total assets 4,685,225 5,041,881    
Liabilities and Stockholders’ Equity        
Accounts payable 78,043 128,131    
Accrued expenses and other current liabilities 153,028 329,450    
Current maturities of debt 0 5,042,353    
Total current liabilities 231,071 5,499,934    
Long-term debt 0 30,953    
Intercompany payables 0 0    
Note payable to Arch Coal 0 0    
Asset retirement obligations 390,634 396,659    
Accrued pension benefits 19,853 27,373    
Accrued postretirement benefits other than pension 87,286 99,810    
Accrued workers’ compensation 118,997 112,270    
Other noncurrent liabilities 33,918 119,171    
Total liabilities not subject to compromise 881,759 6,286,170    
Liabilities subject to compromise 5,430,456 0    
Total liabilities 6,312,215 6,286,170    
Stockholders' equity (1,626,990) (1,244,289)    
Total liabilities and stockholders’ deficit 4,685,225 5,041,881    
Eliminations [Member]        
Assets        
Cash and cash equivalents 0 0 0 0
Short term investments 0 0    
Restricted cash 0 0    
Receivables (4,942) (4,430)    
Inventories 0 0    
Other 0 0    
Total current assets (4,942) (4,430)    
Property, plant and equipment, net 428 413    
Investment in subsidiaries (4,648,697) (4,887,905)    
Intercompany receivables (2,269,237) (2,253,312)    
Note receivable from Arch Western (675,000) (675,000)    
Other 0 0    
Total other assets (7,592,934) (7,816,217)    
Total assets (7,597,448) (7,820,234)    
Liabilities and Stockholders’ Equity        
Accounts payable 0 0    
Accrued expenses and other current liabilities (4,942) (4,430)    
Current maturities of debt 0 0    
Total current liabilities (4,942) (4,430)    
Long-term debt 0 0    
Intercompany payables (2,269,237) (2,253,313)    
Note payable to Arch Coal (675,000) (675,000)    
Asset retirement obligations 0 0    
Accrued pension benefits 0 0    
Accrued postretirement benefits other than pension 0 0    
Accrued workers’ compensation 0 0    
Other noncurrent liabilities 0 0    
Total liabilities not subject to compromise (2,949,179)      
Total liabilities (2,949,179) (2,932,743)    
Stockholders' equity (4,648,269) (4,887,491)    
Total liabilities and stockholders’ deficit (7,597,448) (7,820,234)    
Parent/Issuer [Member]        
Assets        
Cash and cash equivalents 207,932 337,646 367,668 572,185
Short term investments 203,417 200,192    
Restricted cash 0 0    
Receivables 11,935 12,463    
Inventories 0 0    
Other 22,370 18,160    
Total current assets 445,654 568,461    
Property, plant and equipment, net 6,198 7,747    
Investment in subsidiaries 4,648,697 4,887,905    
Intercompany receivables 0 0    
Note receivable from Arch Western 675,000 675,000    
Other 42,945 39,302    
Total other assets 5,366,642 5,602,207    
Total assets 5,818,494 6,178,415    
Liabilities and Stockholders’ Equity        
Accounts payable 28,774 8,495    
Accrued expenses and other current liabilities 66,771 162,268    
Current maturities of debt 0 5,031,603    
Total current liabilities 95,545 5,202,366    
Long-term debt 0 0    
Intercompany payables 2,038,697 2,043,308    
Note payable to Arch Coal 0 0    
Asset retirement obligations 1,043 1,005    
Accrued pension benefits 3,795 12,390    
Accrued postretirement benefits other than pension 72,070 79,826    
Accrued workers’ compensation 16,887 24,247    
Other noncurrent liabilities 11,249 59,976    
Total liabilities not subject to compromise 2,239,286      
Liabilities subject to compromise 5,206,626      
Total liabilities 7,445,912 7,423,118    
Stockholders' equity (1,627,418) (1,244,703)    
Total liabilities and stockholders’ deficit 5,818,494 6,178,415    
Guarantor Subsidiaries [Member]        
Assets        
Cash and cash equivalents 50,426 100,428 60,568 150,358
Short term investments 0 0    
Restricted cash 0 0    
Receivables 992 3,153    
Inventories 172,698 196,720    
Other 26,502 38,794    
Total current assets 250,618 339,095    
Property, plant and equipment, net 3,486,927 3,610,869    
Investment in subsidiaries 0 0    
Intercompany receivables 2,269,237 2,253,312    
Note receivable from Arch Western 0 0    
Other 203,399 243,806    
Total other assets 2,472,636 2,497,118    
Total assets 6,210,181 6,447,082    
Liabilities and Stockholders’ Equity        
Accounts payable 49,237 119,633    
Accrued expenses and other current liabilities 90,356 170,575    
Current maturities of debt 0 10,750    
Total current liabilities 139,593 300,958    
Long-term debt 0 30,953    
Intercompany payables 0 0    
Note payable to Arch Coal 675,000 675,000    
Asset retirement obligations 389,591 395,654    
Accrued pension benefits 16,058 14,983    
Accrued postretirement benefits other than pension 15,216 19,984    
Accrued workers’ compensation 102,110 88,023    
Other noncurrent liabilities 22,461 58,847    
Total liabilities not subject to compromise 1,360,029      
Liabilities subject to compromise 223,830      
Total liabilities 1,583,859 1,584,402    
Stockholders' equity 4,626,322 4,862,680    
Total liabilities and stockholders’ deficit 6,210,181 6,447,082    
Non-Guarantor Subsidiaries [Member]        
Assets        
Cash and cash equivalents 11,456 12,707 $ 11,419 $ 11,688
Short term investments 0 0    
Restricted cash 102,236 97,542    
Receivables 136,479 124,581    
Inventories 0 0    
Other 2,697 969    
Total current assets 252,868 235,799    
Property, plant and equipment, net 0      
Investment in subsidiaries 0 0    
Intercompany receivables 0 0    
Note receivable from Arch Western 0 0    
Other 1,130 819    
Total other assets 1,130 819    
Total assets 253,998 236,618    
Liabilities and Stockholders’ Equity        
Accounts payable 32 3    
Accrued expenses and other current liabilities 843 1,037    
Current maturities of debt 0 0    
Total current liabilities 875 1,040    
Long-term debt 0 0    
Intercompany payables 230,540 210,005    
Note payable to Arch Coal 0 0    
Asset retirement obligations 0 0    
Accrued pension benefits 0 0    
Accrued postretirement benefits other than pension 0 0    
Accrued workers’ compensation 0 0    
Other noncurrent liabilities 208 348    
Total liabilities not subject to compromise 231,623      
Total liabilities 231,623 211,393    
Stockholders' equity 22,375 25,225    
Total liabilities and stockholders’ deficit $ 253,998 $ 236,618