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Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Net Income $ 21,302 $ 11,642 $ 50,270 $ 25,459
Other comprehensive income (loss), net of tax:        
Foreign currency translation adjustment, net of tax of ($23) and ($12) for the three and nine months ended September 30, 2013, respectively 37   19  
Unrealized (loss) gain on available-for-sale securities, net of tax of $29 and $58 for the three months ended September 30, 2013 and 2012, respectively and $207 and $35 for the nine months ended September 30, 2013 and 2012, respectively (48) (89) 91 (54)
Other comprehensive (loss) income (11) (89) 110 (54)
Comprehensive income 21,291 11,553 50,380 25,405
Allocation of comprehensive income to preferred stockholders          (64)
Comprehensive (income) loss attributable to noncontrolling interests (213)   164  
Comprehensive income attributable to common stockholders $ 21,078 $ 11,553 $ 50,544 $ 25,341