Supplemental Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Operations) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]    
Revenues $ 677,005 $ 735,971
Costs, expenses and other    
Cost of sales (exclusive of items shown separately below) 562,322 686,314
Depreciation, depletion and amortization 104,874 104,423
Amortization of acquired sales contracts, net (3,390) (3,696)
Change in fair value of coal derivatives and coal trading activities, net 1,220 914
Asset impairment and mine closure costs 0 0
Selling, general and administrative expenses 22,605 29,136
Other operating (income) expense, net 9,086 (7,998)
Total operating expenses 696,717 809,093
Loss from operations (19,712) (73,122)
Interest expense, net    
Interest expense (99,252) (96,471)
Interest and investment income 2,373 1,843
Interest expense, net (96,879) (94,628)
Loss from continuing operations before income taxes (116,591) (167,750)
Provision for (benefit from) income taxes (3,396) (43,611)
Net loss (113,195) (124,139)
Total comprehensive income (loss) (109,591) (126,769)
Parent/Issuer [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 0 0
Costs, expenses and other    
Cost of sales (exclusive of items shown separately below) 7,470 3,389
Depreciation, depletion and amortization 1,060 1,472
Amortization of acquired sales contracts, net 0 0
Change in fair value of coal derivatives and coal trading activities, net   0
Asset impairment and mine closure costs 0 0
Selling, general and administrative expenses 15,439 19,944
Other operating (income) expense, net 3,700 1,593
Total operating expenses 27,669 26,398
Income from investment in subsidiaries 21,050 (35,347)
Loss from operations (6,619) (61,745)
Interest expense, net    
Interest expense (118,056) (113,655)
Interest and investment income 8,072 7,601
Interest expense, net (109,984) (106,054)
Loss from continuing operations before income taxes (116,603) (167,799)
Provision for (benefit from) income taxes (3,408) (43,660)
Net loss (113,195) (124,139)
Total comprehensive income (loss) (109,591) (126,769)
Guarantor Subsidiaries [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 677,005 735,971
Costs, expenses and other    
Cost of sales (exclusive of items shown separately below) 555,686 683,775
Depreciation, depletion and amortization 103,812 102,942
Amortization of acquired sales contracts, net (3,390) (3,696)
Change in fair value of coal derivatives and coal trading activities, net 1,220 914
Asset impairment and mine closure costs 0 0
Selling, general and administrative expenses 6,243 7,865
Other operating (income) expense, net 5,278 (9,480)
Total operating expenses 668,849 782,320
Income from investment in subsidiaries 0 0
Loss from operations 8,156 (46,349)
Interest expense, net    
Interest expense (6,763) (6,324)
Interest and investment income 19,774 17,651
Interest expense, net 13,011 11,327
Loss from continuing operations before income taxes 21,167 (35,022)
Provision for (benefit from) income taxes 0 0
Net loss 21,167 (35,022)
Total comprehensive income (loss) 24,407 (36,428)
Non-Guarantor Subsidiaries [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 0 0
Costs, expenses and other    
Cost of sales (exclusive of items shown separately below) 0 0
Depreciation, depletion and amortization 2 9
Amortization of acquired sales contracts, net 0 0
Change in fair value of coal derivatives and coal trading activities, net 0 0
Asset impairment and mine closure costs 0 0
Selling, general and administrative expenses 1,448 1,803
Other operating (income) expense, net (1,251) (1,437)
Total operating expenses 199 375
Income from investment in subsidiaries 0 0
Loss from operations (199) (375)
Interest expense, net    
Interest expense (1,275) (1,050)
Interest and investment income 1,369 1,149
Interest expense, net 94 99
Loss from continuing operations before income taxes (105) (276)
Provision for (benefit from) income taxes 12 49
Net loss (117) (325)
Total comprehensive income (loss) (117) (325)
Eliminations [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 0 0
Costs, expenses and other    
Cost of sales (exclusive of items shown separately below) (834) (850)
Depreciation, depletion and amortization 0  
Amortization of acquired sales contracts, net 0 0
Change in fair value of coal derivatives and coal trading activities, net 0 0
Asset impairment and mine closure costs 0 0
Selling, general and administrative expenses (525) (476)
Other operating (income) expense, net 1,359 1,326
Total operating expenses 0  
Income from investment in subsidiaries (21,050) 35,347
Loss from operations (21,050) 35,347
Interest expense, net    
Interest expense 26,842 24,558
Interest and investment income (26,842) (24,558)
Interest expense, net 0 0
Loss from continuing operations before income taxes (21,050) 35,347
Provision for (benefit from) income taxes 0 0
Net loss (21,050) 35,347
Total comprehensive income (loss) $ (24,290) $ 36,753