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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 51,309 $ 45,282
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 12,409 14,322
Non-cash interest charge, net 149 150
Change in operating assets and liabilities:    
Accounts receivable (1,237) (4,530)
Other assets 200 222
Accounts payable and accrued liabilities 1,083 (1,147)
Accrued interest (2,895) (7,034)
Deferred revenue (2,449) 5,434
Accrued incentive plan expenses (6,592) (2,827)
Property, franchise and other taxes payable (2,492) (2,838)
Net cash provided by operating activities 49,485 47,034
Cash flows from investing activities:    
Acquisition of land, coal and other mineral rights (67,726) (84,822)
Acquisition or construction of plant and equipment (10,128) (162)
Proceeds from sale of assets   100
Acquisition of contracts - affiliate (48,881)  
Net cash used in investing activities (126,735) (84,884)
Cash flows from financing activities:    
Proceeds from loans 47,000 85,000
Repayment of loans (15,191) (15,193)
Costs associated with equity transactions   (32)
Distributions to partners (62,077) (58,423)
Net cash provided by (used in) financing activities (30,268) 11,352
Net decrease in cash and cash equivalents (107,518) (26,498)
Cash and cash equivalents at beginning of period 214,922 95,506
Cash and cash equivalents at end of period 107,404 69,008
Supplemental cash flow information:    
Cash paid during the period for interest 16,292 17,459
Non-cash activities:    
Obligation related to purchase of reserves and infrastructure   $ 6,025