Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

Postemployment Benefits [Abstract]

Information Regarding Activity in Stock Option Plans

Information regarding activity in our stock option plans follows:

	Number of Options			Weighted- Average Exercise Price Per Share
Outstanding at December 31, 2014		8,183,430		$	14.69
Granted - 2015		1,710,500			13.64
Exercised - 2015		(983,370	)		13.91
Forfeited - 2015		(114,967	)		15.30
Expired - 2015		(641	)		14.00
Outstanding at December 31, 2015		8,794,952			14.57
Granted - 2016		1,417,500			16.44
Exercised - 2016		(832,467	)		13.44
Forfeited - 2016		(41,337	)		14.97
Outstanding at December 31, 2016		9,338,648			14.95
Granted - 2017		943,000			17.58
Exercised - 2017		(924,019	)		14.45
Forfeited - 2017		(93,167	)		15.43
Outstanding at December 31, 2017		9,264,462		$	15.26
Exercisable at:
December 31, 2015		5,250,338		$	14.42
December 31, 2016		6,347,470		$	14.77
December 31, 2017		6,946,677		$	14.90

Summary of Information about Stock Options Outstanding

The following table summarizes information about stock options outstanding at December 31, 2017:

Grant Date	Exercise Price		Number of Options Outstanding		Weighted-Average Remaining Contractual Life		Number of Options Exercisable
July 27, 2011	$	12.50		1,027,606		4.0 years		1,027,606
December 20, 2012		14.50		1,062,319		5.0 years		1,062,319
December 19, 2013		15.90		2,102,006		6.0 years		2,102,006
December 18, 2014		15.80		1,362,415		7.0 years		1,362,415
December 17, 2015		13.64		1,404,174		3.0 years		936,022
December 15, 2016		16.48		1,368,942		4.0 years		456,309
December 21, 2017		17.60		937,000		5.0 years		—
Total				9,264,462				6,946,677

Summary of Plan Activity

A summary of plan activity follows:

	Shares Issued
	Price		Shares
January 1, 2015	$	12.40		17,662
July 1, 2015		12.95		20,006
January 1, 2016		11.97		18,387
July 1, 2016		11.83		22,418
January 1, 2017		13.76		18,512
July 1, 2017		13.52		25,155