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Significant Acquisitions (Details Textuals) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended 9 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
Feb. 19, 2012
Dec. 31, 2011
BRP LLC [Member]
Dec. 31, 2010
BRP LLC [Member]
Jun. 30, 2010
BRP LLC [Member]
Sep. 30, 2009
Colt [Member]
T
Dec. 31, 2011
Colt [Member]
T
Acquisitions (Textual) [Abstract]                                  
Purchase price                             $ 42,500,000 $ 255,000,000  
Amount paid at closing                       70,000,000         175,000,000
Percentage of income interest as a result of acquisition                             51.00%    
Percentage of minority voting interest of IPC                             49.00%    
Assets fair value using a cash flows approach                         38,300,000        
Total asset fair value                         47,200,000        
Non-controlling interests, Estimated fair value                         4,700,000        
Net income (19,357,000) (30,559,000) 56,206,000 45,282,000 42,506,000 40,153,000 41,611,000 30,191,000 54,026,000 154,461,000 114,080,000   5,200,000 2,300,000      
Transaction expenses related to acquisition                         $ 600,000 $ 2,500,000      
Coal reserve agreed to acquire under partnership agreement                               200,000,000 92,100,000