Condensed Consolidated Statements of Comprehensive Operations (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements of Comprehensive Operations (unaudited) [Abstract]
Net income (loss)	$ 113,467,000	$ (14,190,000)
Other comprehensive income, net of income tax:
Net unrealized gain on available-for-sale securities, net of tax of $2,550	0	4,163,000
Interest rate lock derivative contracts reclassified to income, net of tax of $11 and $11, respectively	18,000	17,000
Total other comprehensive income	18,000	4,180,000
Comprehensive income (loss)	$ 113,485,000	$ (10,010,000)