Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

Summary of Company's Share-Based Compensation Activity and Related Information

A summary of the Company’s share-based compensation activity and related information is as follows:

	2017
	Shares (1)		Weighted- Average Exercise Price (2)
	(In Thousands)
Outstanding at beginning of year	3,878		$	79
Granted	917		90
Exercised	(348	)	61
Forfeited	(247	)	92
Outstanding at end of year (3)	4,200		$	82
Exercisable at end of year	2,514		$	77
Shares available for future grants	8,368

(1) Shares include Restricted Stock Units (RSUs).

(2) The weighted-average exercise price excludes RSUs.

(3) The exercise prices for SARs outstanding as of December 31, 2017 ranged from approximately $42 to $100. The weighted-average remaining contractual life of all SARs outstanding is approximately six years.

Summary of Company's Nonvested Share Awards (RSUs) Activity

A summary of the Company’s nonvested share awards activity is as follows:

Nonvested Share Awards (RSUs)	Shares		Weighted- Average Grant Date Fair Value
	(In Thousands)
Nonvested at January 1, 2017	408		$	92
Granted	171		90
Vested	(80	)	84
Forfeited	(93	)	88
Nonvested at December 31, 2017	406		$	91