Equity Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2018

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

Schedule of Outstanding and Exercisable Options

The following table is a summary of outstanding and exercisable options as of March 31, 2018:

In thousands except per share amounts	Shares	Weighted- Average Exercise Price		Aggregate Intrinsic Value
Outstanding at March 31, 2018	417	$	34.36	$	6,732
Exercisable at March 31, 2018	207	$	21.90	$	5,611
Unvested at March 31, 2018	210	$	46.64	$	1,121