Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

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

Restricted Stock Awards

	Awards		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2016	850,422		$	67.25
Granted	223,139		75.45
Vested	(270,335	)	70.93
Forfeited	(100,448	)	68.79
Nonvested at December 31, 2017	702,778		$	68.23