Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 37,773	$ 145,420	$ 9,642
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on available-for-sale securities, net of tax of $81 for the year ended December 31, 2012	(273)	294	(163)
Other comprehensive (loss) income	(273)	294	(163)
Total comprehensive income	37,500	145,714	9,479
Comprehensive income attributable to noncontrolling interests	(101)
Preferred stockholder dividends		(9,482)	(3,289)
Allocation of comprehensive income to preferred stockholders	(64)	(24,260)	(1,144)
Comprehensive income attributable to common stockholders	$ 37,335	$ 111,972	$ 5,046