Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income		$ 146,984	$ 109,522	$ 92,486
Less: Net (income) loss attributable to redeemable noncontrolling interest		(12,363)	4,374	(547)
Net income attributable to common stockholders		134,621	113,896	91,939
Other comprehensive income (loss), net of tax:
Foreign currency translation income (loss)		997	(2,557)	2,064
Net unrealized gain (loss) from available-for-sale investments	[1]	0	0	497
Reclassification to statements of operations of realized (gain) loss from available-for-sale investments		0	0	(347)
Other comprehensive income (loss)		997	(2,557)	2,214
Total comprehensive income attributable to common stockholders		$ 135,618	$ 111,339	$ 94,153

[1] Due to the adoption and application of the amendments to the financial instruments accounting standard on January 1, 2018, realized and unrealized gains (losses) from equity investments at fair value are recognized through earnings rather than through other comprehensive income.