Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Non-Vested Restricted Stock Activity

The following table summarizes the non-vested restricted stock activity for the year ended December 31, 2017:

			Weighted
			Average
			Grant Date
Non-vested restricted stock	Shares		Fair Value
Non-vested January 1, 2017		780,940	$	35.48
Granted		428,333	$	43.31
Vested		(237,690)	$	35.60
Forfeited		(96,257)	$	39.10
Non-vested at December 31, 2017		875,326	$	38.88

Schedule of Restricted Stock Granted

The following table summarizes the restricted stock granted during the respective years:

Restricted stock grants	2017		2016		2015
Employees		396,708		394,243		316,531
Outside directors		31,625		26,125		22,000
Total		428,333		420,368		338,531
Weighted average grant date fair value	$	43.31	$	33.46	$	37.60
Vesting period	3-5 years		3-5 years		3-5 years