Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 77,130	$ 37,773	$ 145,420
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax of ($50) for the year ended December 31, 2013	81
Unrealized gain (loss) on available-for-sale securities, net of tax of $223 and $81 for the years ended December 31, 2013 and 2012, respectively	56	(273)	294
Other comprehensive income (loss)	137	(273)	294
Comprehensive income	77,267	37,500	145,714
Comprehensive income attributable to noncontrolling interests	(1,940)	(101)
Preferred stockholder dividends			(9,482)
Allocation of comprehensive income to preferred stockholders		(64)	(24,260)
Comprehensive income attributable to common stockholders	$ 75,327	$ 37,335	$ 111,972