Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 16,276	$ (3,703)	$ 36,846	$ 25,034
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax of ($28) for the three months ended September 30, 2015 and ($348) and $167 for the nine months ended September 30, 2016 and 2015, respectively	0	49	569	(271)
Unrealized (loss) gain on available-for-sale securities, net of tax of $31 and $35 for the three months ended September 30, 2016 and 2015, respectively and ($140) and $26 for the nine months ended September 30, 2016 and 2015 respectively	(50)	(290)	230	(389)
Other comprehensive (loss) income	(50)	(241)	799	(660)
Comprehensive income (loss)	16,226	(3,944)	37,645	24,374
Comprehensive (income) loss attributable to noncontrolling interests	(651)	3,054	(770)	3,436
Comprehensive Income (Loss) Attributable to Common Stockholders	$ 15,575	$ (890)	$ 36,875	$ 27,810