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Quarterly Financial Data - Unaudited (Results of Operations) (Details) (USD $)
 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
Quarterly Financial Data - Unaudited [Abstract]                      
Revenues $ 116,876,000 $ 87,596,000 $ 67,206,000 $ 58,744,000 $ 49,147,000 $ 32,978,000 $ 26,734,000 $ 20,068,000      
Operating income (loss) 54,336,000 40,273,000 32,414,000 25,544,000 12,993,000 10,831,000 648,000 (2,479,000) 152,567,000 21,993,000 (9,555,000)
Net income (loss) (13,401,000) 66,289,000 33,349,000 (6,847,000) 1,587,000 [1] (1,701,000) [1] (26,350,000) [1] (3,231,000) [1]      
Estimated net deferred tax expense             29,200,000        
Additional discrete deferred tax expense           $ 6,200,000          
[1] In connection with the closing of the Company's IPO, it merged into a corporation and became subject to federal and state entity-level taxation. At June 30, 2010, the Company recorded an estimated net deferred tax expense of $29.2 million to recognize a deferred tax liability for the initial book and tax basis differences. At September 30, 2010, the Company recorded an additional $6.2 million discrete deferred tax expense for changes in estimates on its initial deferred tax liability recorded in June. See Note 11.