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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 54,026 $ 154,461 $ 114,080
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 65,118 56,978 60,012
Non-cash interest charge 625 540 1,463
Non-cash gain on reserve swap (2,990)    
Gain on sale of assets (1,058)    
Asset impairment 161,336    
Non-controlling interest 998 5,065  
Change in operating assets and liabilities:      
Accounts receivable (6,951) (2,627) 581
Other assets 90 (27) (67)
Accounts payable and accrued liabilities 854 468 (133)
Accrued interest 950 (489) 3,850
Deferred revenue 31,277 42,491 26,264
Accrued incentive plan expenses 1,909 6,137 4,577
Property, franchise and other taxes payable (610) 762 42
Net cash provided by operating activities 305,574 258,694 210,669
Cash flows from investing activities:      
Acquisition of land, coal, other mineral rights and related intangibles (120,184) (166,382) (118,754)
Acquisition or construction of plant and equipment (404) (5,994) (1,157)
Proceeds from sale of assets 5,500 1,580  
Net cash used in investing activities (115,088) (170,796) (119,911)
Cash flows from financing activities:      
Proceeds from loans 385,000 140,000 331,000
Proceeds from issuance of units   110,436  
Deferred financing costs (2,957)   (661)
Repayments of loans (210,519) (106,234) (168,235)
Payment of obligation related to acquisitions (7,625) (9,169) (72,000)
Costs associated with equity transactions (141) (219) (21)
Fees associated with elimination of IDRs   (2,341)  
Distributions (234,828) (209,849) (188,135)
Contributions by general partner   2,350  
Net cash used in financing activities (71,070) (75,026) (98,052)
Net increase (decrease) in cash and cash equivalents 119,416 12,872 (7,294)
Cash and cash equivalents at beginning of period 95,506 82,634 89,928
Cash and cash equivalents at end of period 214,922 95,506 82,634
Supplemental cash flow information:      
Cash paid during the period for interest 47,653 41,565 34,710
Non-cash investing activities:      
Equity issued for acquisitions     95,910
Assets contributed by general partner for acquisitions     1,981
Liability assumed in acquisitions   1,593 1,170
Non-controlling interest 373 (5,065)  
Non-cash financing activities:      
Purchase obligation related to reserve and infrastructure acquisitions $ 500 $ 6,200 $ 74,022