Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

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

Schedule of Share-based Compensation, Stock Options, Activity

Stock option activity, including options granted under the Plan and the Non-Plan Grants, was as follows (in thousands, except number of shares and per share amounts):

	2018						2017
	Shares		Weighted Average Exercise Price Per Share		Weighted Average Fair Value at Grant Date Per Share		Shares		Weighted Average Exercise Price Per Share		Weighted Average Fair Value at Grant Date Per Share
Outstanding at January 1		67,465	$	71.03	$	36.85		100,492	$	62.52	$	33.84
Cancelled or expired		(131)		88.82		55.76		(1,486)		88.08		50.88
Outstanding at March 31		67,334	$	74.70	$	36.74		99,006	$	62.16	$	33.60
Exercisable at March 31		67,334	$	74.70	$	36.74		30,971	$	141.72	$	68.52