Performance Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2017

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

Schedule of Restricted Stock Activity

The following summarizes the restricted stock activity for the year ended December 31, 2017:

	Number of Shares		Weighted Average Share Price
Non-vested restricted shares, January 1	871,718		$	38.88
Restricted shares granted	292,968		43.61
Restricted shares vested	(410,497	)	35.80
Restricted shares forfeited	(11,356	)	33.42
Restricted shares repurchased	(7,510	)	30.80
Non-vested restricted shares, December 31	735,323		42.65

Schedule of Other Share-based Compensation, Activity

The following summarizes other grants made during the year ended December 31, 2017, pursuant to the 2017 Plan.

	Shares	Weighted Average   Share Price
Other share grants under the 2017 Plan:
Directors’ fees	14,007	$	40.09
Deferred directors’ fees	21,329	40.31
	35,336	40.22
Shares available under the 2017 Plan for grant, end of period	1,733,296