Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

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 March 31,	2018			2017
Stock options, net of estimated forfeitures	$	(7,166	)	$	19,281
Restricted stock awards	3,410			3,107
Total	$	(3,756	)	$	22,388