Share-based Compensation (Tables)

6 Months Ended

Jun. 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 June 30,				For the six months ended June 30,
	2017		2016		2017		2016
Stock options, net of estimated forfeitures	$	9,550	$	11,141	$	28,831	$	16,296
Restricted stock awards	3,399		2,390		6,506		4,315
Total non-cash stock compensation	12,949		13,531		35,337		20,611
Deferred compensation arrangement	—		214		—		298
Total	$	12,949	$	13,745	$	35,337	$	20,909