Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Share-based Compensation [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

Total stock compensation expense and the total related tax benefit recognized are as follows:

	Three months ended				Nine months ended
	September 30,				September 30,
	2017		2016		2017		2016
Stock compensation expense	$	11,210	$	10,476	$	39,036	$	34,264
Recognized tax benefit	$	2,311	$	2,149	$	8,187	$	5,928