Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of share-based compensation expense

Share-based compensation expense was as follows:

	For the three months ended September 30,				For the nine months ended September 30,
	2017		2016		2017		2016
Stock options, net of estimated forfeitures	$	4,590	$	5,578	$	33,421	$	21,527
Restricted stock awards	4,042		2,235		10,548		6,897
Total non-cash stock compensation	8,632		7,813		43,969		28,424
Deferred compensation arrangement	—		216		—		515
Total	$	8,632	$	8,029	$	43,969	$	28,939