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Segment Information (Schedule Of Operating Segment Results) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting Information [Line Items]                      
Revenues                 $ 4,285,895 $ 3,186,268 $ 2,576,081
Income (loss) from operations 139,728 76,256 95,354 102,238 86,938 98,347 106,499 32,200 413,576 323,984 123,714
Total assets 10,213,959       4,880,769       10,213,959 4,880,769 4,840,596
Depreciation, depletion and amortization                 466,587 365,066 301,608
Amortization of acquired sales contacts, net                 (22,069) 35,606 19,623
Capital expenditures                 540,936 314,657 323,150
Number of reportable business segments                 three    
PRB [Member]
                     
Segment Reporting Information [Line Items]                      
Revenues                 1,646,947 1,606,236 1,205,492
Income (loss) from operations                 180,730 146,555 82,341
Total assets 2,307,783       2,295,786       2,307,783 2,295,786 2,421,917
Depreciation, depletion and amortization                 171,693 185,218 127,378
Amortization of acquired sales contacts, net                 19,458 35,606 19,934
Capital expenditures                 110,999 38,142 58,275
APP [Member]
                     
Segment Reporting Information [Line Items]                      
Revenues                 1,915,090 1,042,490 829,895
Income (loss) from operations                 283,404 193,943 105,241
Total assets 4,740,723       706,624       4,740,723 706,624 734,309
Depreciation, depletion and amortization                 203,759 97,764 88,409
Amortization of acquired sales contacts, net                 (39,988)    
Capital expenditures                 217,435 70,839 48,673
WBIT [Member]
                     
Segment Reporting Information [Line Items]                      
Revenues                 672,766 537,542 540,694
Income (loss) from operations                 119,665 58,082 29,722
Total assets 681,393       677,611       681,393 677,611 687,873
Depreciation, depletion and amortization                 81,235 80,497 83,781
Amortization of acquired sales contacts, net                     (311)
Capital expenditures                 66,356 65,470 67,299
Other [Member]
                     
Segment Reporting Information [Line Items]                      
Revenues                 51,092    
Income (loss) from operations                 (4,685)    
Total assets 581,040               581,040    
Depreciation, depletion and amortization                 7,876    
Amortization of acquired sales contacts, net                 (1,539)    
Capital expenditures                 28,243    
Corporate, Other And Eliminations [Member]
                     
Segment Reporting Information [Line Items]                      
Income (loss) from operations                 (165,538) (74,596) (93,590)
Total assets 1,903,020       1,200,748       1,903,020 1,200,748 996,497
Depreciation, depletion and amortization                 2,024 1,587 2,040
Capital expenditures                 $ 117,903 $ 140,206 $ 148,903