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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current assets:    
Cash and cash equivalents $ 214,922 $ 95,506
Accounts receivable, net of allowance for doubtful accounts 30,923 26,195
Accounts receivable - affiliates 10,138 7,915
Other 832 910
Total current assets 256,815 130,526
Land 24,534 24,543
Plant and equipment, net 46,185 62,348
Coal and other mineral rights, net 1,257,501 1,281,636
Intangible assets, net 75,164 161,931
Loan financing costs, net 4,846 2,436
Other assets 604 616
Total assets 1,665,649 1,664,036
Current liabilities:    
Accounts payable and accrued liabilities 2,366 1,388
Accounts payable - affiliates 375 499
Obligation related to acquisition 500 0
Current portion of long-term debt 30,801 31,518
Accrued incentive plan expenses - current portion 8,374 6,788
Property, franchise and other taxes payable 6,316 6,926
Accrued interest 10,761 9,811
Total current liabilities 59,493 56,930
Deferred revenue 113,303 109,509
Accrued incentive plan expenses 11,670 11,347
Long-term debt 836,268 661,070
Partners' capital:    
Common units outstanding: (106,027,836) 629,253 806,529
General partner's interest 10,517 14,132
Non-controlling interest 5,639 5,065
Accumulated other comprehensive loss (493) (546)
Total partners' capital 644,915 825,180
Total liabilities and partners' capital $ 1,665,649 $ 1,664,036