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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net Income $ 9,012 $ 19,792 $ 28,737 $ 41,559
Other comprehensive income (loss), net of tax:        
Foreign currency translation adjustment, net of tax of $30 and $8 for the three months ended June 30, 2015 and 2014, respectively and $195 and $(7) for the six months ended June 30, 2015 and 2014, respectively (49) (11) (320) 13
Unrealized (loss) gain on available-for-sale securities, net of tax of $62 and $(75) for the three months ended June 30, 2015 and 2014, respectively and $61 and $(115) for the six months ended June 30, 2015 and 2014, respectively (103) 122 (99) 185
Other comprehensive (loss) income (152) 111 (419) 198
Comprehensive income 8,860 19,903 28,318 41,757
Comprehensive loss (income) attributable to noncontrolling interests 765 (249) 382 (78)
Comprehensive income attributable to common stockholders $ 9,625 $ 19,654 $ 28,700 $ 41,679